diff --git a/.gitlab/ci/rails.gitlab-ci.yml b/.gitlab/ci/rails.gitlab-ci.yml
index bc2c708ca42c784a74d3b14bd47e42a444bc9ec7..bc2d78190809603560ccb1d5d016c70d5c1c26a3 100644
--- a/.gitlab/ci/rails.gitlab-ci.yml
+++ b/.gitlab/ci/rails.gitlab-ci.yml
@@ -221,21 +221,6 @@ rspec system pg16:
   variables:
     DEBUG_GITLAB_TRANSACTION_STACK: "true"
 
-rspec system pg16 classic-ui:
-  tags:
-    - $GLCI_MEDIUM_RUNNER_REQUIRED
-  extends:
-    - .rspec-base-pg16
-    - .rspec-system-parallel
-    - .rails:rules:ee-only-system
-  variables:
-    DEBUG_GITLAB_TRANSACTION_STACK: "true"
-    GLCI_OVERRIDE_PROJECT_STUDIO_ENABLED: "false"
-  rules:
-    - if: '$CI_MERGE_REQUEST_IID == null'
-      when: never
-    - !reference [.rails:rules:ee-only-system, rules]
-
 rspec system pg16 vue3:
   extends:
     - rspec system pg16
@@ -1001,20 +986,6 @@ rspec-ee system pg16:
     - .rspec-ee-system-parallel
     - .rails:rules:ee-only-system
 
-rspec-ee system pg16 classic-ui:
-  tags:
-    - $GLCI_MEDIUM_RUNNER_REQUIRED
-  extends:
-    - .rspec-ee-base-pg16
-    - .rspec-ee-system-parallel
-    - .rails:rules:ee-only-system
-  variables:
-    GLCI_OVERRIDE_PROJECT_STUDIO_ENABLED: "false"
-  rules:
-    - if: '$CI_MERGE_REQUEST_IID == null'
-      when: never
-    - !reference [.rails:rules:ee-only-system, rules]
-
 rspec-ee system pg16 single-db:
   extends:
     - rspec-ee system pg16
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index d80672e13f0ed214c140aa84c3a03a7688917b2b..446dbbc635b5eb167400624306df611564fdecde 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -132,7 +132,7 @@ def simple_sanitize(str)
   end
 
   def project_studio_enabled?
-    Users::ProjectStudio.new(current_user).enabled?
+    true
   end
 
   def body_data
diff --git a/app/models/users/project_studio.rb b/app/models/users/project_studio.rb
deleted file mode 100644
index 47b79996353b9ae67bd7bc3f9bb3a5fbd704be15..0000000000000000000000000000000000000000
--- a/app/models/users/project_studio.rb
+++ /dev/null
@@ -1,24 +0,0 @@
-# frozen_string_literal: true
-
-module Users
-  class ProjectStudio
-    # Convenience class method for checking if Project Studio is enabled for a user.
-    def self.enabled_for_user?(user)
-      new(user).enabled?
-    end
-
-    def initialize(user)
-      @user = user
-    end
-
-    def enabled?
-      return false if ENV["GLCI_OVERRIDE_PROJECT_STUDIO_ENABLED"] == "false"
-
-      Feature.enabled?(:paneled_view, user)
-    end
-
-    private
-
-    attr_reader :user
-  end
-end
diff --git a/app/policies/global_policy.rb b/app/policies/global_policy.rb
index 338861d589b2bbcd0f4eedeb8b510c46b46c5a5a..ebb29df728a2b3643c6f99d8e29b68eba2e6bcab 100644
--- a/app/policies/global_policy.rb
+++ b/app/policies/global_policy.rb
@@ -47,7 +47,7 @@ class GlobalPolicy < BasePolicy
   end
 
   condition(:project_studio_available, scope: :user, score: 0) do
-    ::Users::ProjectStudio.new(@user).enabled?
+    true
   end
 
   rule { bot & ~bot_with_quick_actions_permitted }.policy do
diff --git a/config/feature_flags/beta/paneled_view.yml b/config/feature_flags/beta/paneled_view.yml
deleted file mode 100644
index c1e3d745a86c24995da3945c1784cb76cab3c2dd..0000000000000000000000000000000000000000
--- a/config/feature_flags/beta/paneled_view.yml
+++ /dev/null
@@ -1,10 +0,0 @@
----
-name: paneled_view
-description:
-feature_issue_url:
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/201307
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/work_items/574049
-milestone: '18.3'
-group: group::project management
-type: beta
-default_enabled: true
diff --git a/doc/user/interface_redesign.md b/doc/user/interface_redesign.md
index 6086fa5f334c756f05cd9dd6aa1e14ea2b490ef2..07a28f9ede50702d14386333bfcf1e89dcdab86c 100644
--- a/doc/user/interface_redesign.md
+++ b/doc/user/interface_redesign.md
@@ -19,6 +19,7 @@ description: Learn about an upcoming redesign of GitLab user interface.
   Disabled by default.
 - [Enabled on GitLab.com, GitLab Self-Managed, and GitLab Dedicated](https://gitlab.com/gitlab-org/gitlab/-/work_items/574049) in GitLab 18.6.
 - Toggle [removed](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/212303) in GitLab 18.7.
+- [Generally available](https://gitlab.com/gitlab-org/gitlab/-/work_items/574049) in GitLab 18.8. Feature flag `paneled_view` removed.
 
 {{< /history >}}
 
diff --git a/ee/spec/features/admin/admin_mode_spec.rb b/ee/spec/features/admin/admin_mode_spec.rb
index 4db8a2fbf148a4acf3c39545e9421ca47f063cff..ab44b6f0c9701c004835348206198c50a49d3ea0 100644
--- a/ee/spec/features/admin/admin_mode_spec.rb
+++ b/ee/spec/features/admin/admin_mode_spec.rb
@@ -18,7 +18,7 @@
         it 'can enter admin mode via admin button' do
           visit root_dashboard_path
 
-          find_by_testid('user-avatar-content').click if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
+          find_by_testid('user-avatar-content').click
           click_link 'Admin'
 
           wait_for_requests
@@ -38,6 +38,7 @@
           it 'can access admin dashboard without entering admin mode' do
             visit root_dashboard_path
 
+            expect(page).to have_link('Admin')
             click_link 'Admin'
 
             expect(page).to have_current_path(admin_root_path)
@@ -53,6 +54,7 @@
         it 'can access admin dashboard without entering admin mode' do
           visit root_dashboard_path
 
+          expect(page).to have_link('Admin')
           click_link 'Admin'
 
           expect(page).to have_current_path(admin_root_path)
diff --git a/ee/spec/features/ai_sidepanel_spec.rb b/ee/spec/features/ai_sidepanel_spec.rb
index 443626f8ae515e80aae92e3ecb81f4790d36ebf3..5e4296f319b5605430dddecfa91958e97bf6c104 100644
--- a/ee/spec/features/ai_sidepanel_spec.rb
+++ b/ee/spec/features/ai_sidepanel_spec.rb
@@ -32,141 +32,120 @@
     allow(::Gitlab::Llm::TanukiBot).to receive_messages(chat_disabled_reason: nil, credits_available?: true)
   end
 
-  context 'when Project Studio IS NOT enabled' do
-    before do
-      # NOTE: We will stub all existing methods on Users::ProjectStudio to return false, to ensure that
-      #       it always is disabled, regardless of how it may be refactored in the future.
-      project_studio_instance = instance_double(Users::ProjectStudio, enabled?: false)
-      allow(Users::ProjectStudio).to receive_messages(new: project_studio_instance, enabled_for_user?: false)
-    end
+  describe 'sidepanel visibility' do
+    it 'shows the AI sidepanel toggle and can expand' do
+      # Enable Agentic mode so sessions toggle appears
+      set_cookie('duo_agentic_mode_on', 'true')
 
-    it 'does not show AI sidepanel' do
       visit project_path(project)
 
-      expect(page).not_to have_css(ai_sidepanel_selector)
+      expect(page).to have_css(ai_sidepanel_selector)
+
+      expect(page).not_to have_content("Sessions")
+
+      within(ai_sidepanel_selector) do
+        find_by_testid(sessions_toggle_selector).click
+      end
+
+      # Verify we're now in the agent sessions view
+      expect(page).to have_content("Sessions")
     end
   end
 
-  context 'when Project Studio IS enabled' do
-    before do
-      skip 'Test not applicable in classic UI' unless Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
+  describe 'agent sessions in sidepanel' do
+    let_it_be(:workflow1) do
+      create(:duo_workflows_workflow,
+        project: project,
+        user: user,
+        goal: 'Fix pipeline issues',
+        workflow_definition: 'issue_to_mr',
+        environment: :web)
     end
 
-    describe 'sidepanel visibility' do
-      it 'shows the AI sidepanel toggle and can expand' do
-        # Enable Agentic mode so sessions toggle appears
-        set_cookie('duo_agentic_mode_on', 'true')
-
-        visit project_path(project)
-
-        expect(page).to have_css(ai_sidepanel_selector)
+    let_it_be(:workflow2) do
+      create(:duo_workflows_workflow,
+        project: project,
+        user: user,
+        goal: 'Review code changes',
+        workflow_definition: 'code_review',
+        environment: :web)
+    end
 
-        expect(page).not_to have_content("Sessions")
+    before do
+      # Enable Agentic mode so sessions toggle appears
+      set_cookie('duo_agentic_mode_on', 'true')
 
-        within(ai_sidepanel_selector) do
-          find_by_testid(sessions_toggle_selector).click
-        end
+      visit project_path(project)
 
-        # Verify we're now in the agent sessions view
-        expect(page).to have_content("Sessions")
+      within(ai_sidepanel_selector) do
+        find_by_testid(sessions_toggle_selector).click
       end
     end
 
-    describe 'agent sessions in sidepanel' do
-      let_it_be(:workflow1) do
-        create(:duo_workflows_workflow,
-          project: project,
-          user: user,
-          goal: 'Fix pipeline issues',
-          workflow_definition: 'issue_to_mr',
-          environment: :web)
-      end
+    it 'displays the sessions list' do
+      expect(page).to have_content("Issue to mr ##{workflow1.id}")
+      expect(page).to have_content("Code review ##{workflow2.id}")
+    end
 
-      let_it_be(:workflow2) do
-        create(:duo_workflows_workflow,
-          project: project,
-          user: user,
-          goal: 'Review code changes',
-          workflow_definition: 'code_review',
-          environment: :web)
-      end
+    it 'navigates to session details when clicked' do
+      expect(page).not_to have_content('Activity')
+      expect(page).not_to have_content('Details')
 
-      before do
-        # Enable Agentic mode so sessions toggle appears
-        set_cookie('duo_agentic_mode_on', 'true')
+      expect(page).to have_selector('a[href*="/agent-sessions/"]')
+      find('a[href*="/agent-sessions/"]', match: :first).click
 
-        visit project_path(project)
+      expect(page).to have_content('Activity')
+      expect(page).to have_content('Details')
 
-        within(ai_sidepanel_selector) do
-          find_by_testid(sessions_toggle_selector).click
-        end
-      end
-
-      it 'displays the sessions list' do
-        expect(page).to have_content("Issue to mr ##{workflow1.id}")
-        expect(page).to have_content("Code review ##{workflow2.id}")
-      end
+      expect(page).to have_selector('.gl-tab-nav-item.active', text: 'Activity')
+      expect(page).to have_no_content('GraphQL error:')
+    end
 
-      it 'navigates to session details when clicked' do
-        expect(page).not_to have_content('Activity')
-        expect(page).not_to have_content('Details')
+    it 'can view session details tab' do
+      find('a[href*="/agent-sessions/"]', match: :first).click
 
-        expect(page).to have_selector('a[href*="/agent-sessions/"]')
-        find('a[href*="/agent-sessions/"]', match: :first).click
+      click_link 'Details'
 
-        expect(page).to have_content('Activity')
-        expect(page).to have_content('Details')
+      expect(page).to have_content('Details')
+      expect(page).to have_content(project.name)
+      expect(page).to have_no_content('GraphQL error:')
+    end
+  end
 
-        expect(page).to have_selector('.gl-tab-nav-item.active', text: 'Activity')
-        expect(page).to have_no_content('GraphQL error:')
-      end
+  describe 'agent sessions empty state in sidepanel' do
+    before do
+      Ai::DuoWorkflows::Workflow.where(project: project, user: user).delete_all
 
-      it 'can view session details tab' do
-        find('a[href*="/agent-sessions/"]', match: :first).click
+      # Enable Agentic mode so sessions toggle appears
+      set_cookie('duo_agentic_mode_on', 'true')
 
-        click_link 'Details'
+      visit project_path(project)
+    end
 
-        expect(page).to have_content('Details')
-        expect(page).to have_content(project.name)
-        expect(page).to have_no_content('GraphQL error:')
+    it 'shows empty state when no sessions exist' do
+      within(ai_sidepanel_selector) do
+        find_by_testid(sessions_toggle_selector).click
       end
+
+      expect(page).to have_content('No agent sessions yet', wait: 10)
     end
 
-    describe 'agent sessions empty state in sidepanel' do
+    context 'when duo features are disabled' do
       before do
-        Ai::DuoWorkflows::Workflow.where(project: project, user: user).delete_all
-
-        # Enable Agentic mode so sessions toggle appears
-        set_cookie('duo_agentic_mode_on', 'true')
-
+        project.project_setting.update!(duo_features_enabled: false)
+        allow(::Gitlab::Llm::TanukiBot).to receive(:chat_disabled_reason).and_return(:project)
         visit project_path(project)
       end
 
-      it 'shows empty state when no sessions exist' do
+      it 'prevents access to sessions tab' do
         within(ai_sidepanel_selector) do
-          find_by_testid(sessions_toggle_selector).click
-        end
-
-        expect(page).to have_content('No agent sessions yet', wait: 10)
-      end
-
-      context 'when duo features are disabled' do
-        before do
-          project.project_setting.update!(duo_features_enabled: false)
-          allow(::Gitlab::Llm::TanukiBot).to receive(:chat_disabled_reason).and_return(:project)
-          visit project_path(project)
-        end
-
-        it 'prevents access to sessions tab' do
-          within(ai_sidepanel_selector) do
-            sessions_button = find_by_testid(sessions_toggle_selector)
+          sessions_button = find_by_testid(sessions_toggle_selector)
 
-            expect(sessions_button['aria-disabled']).to eq('true')
+          expect(sessions_button['aria-disabled']).to eq('true')
 
-            sessions_button.click
+          sessions_button.click
 
-            expect(page).not_to have_content('No agent sessions yet')
-          end
+          expect(page).not_to have_content('No agent sessions yet')
         end
       end
     end
diff --git a/ee/spec/features/duo_chat/user_navigates_duo_chat_history_spec.rb b/ee/spec/features/duo_chat/user_navigates_duo_chat_history_spec.rb
index 1742d3d64f67feb3aa9c848d62aa7d20869401e9..afc37df7adcd647dfb3a817060f1b7bf0a94f259 100644
--- a/ee/spec/features/duo_chat/user_navigates_duo_chat_history_spec.rb
+++ b/ee/spec/features/duo_chat/user_navigates_duo_chat_history_spec.rb
@@ -46,7 +46,6 @@ def close_popover
     allow(::Gitlab::Llm::TanukiBot).to receive(:credits_available?).and_return(true)
 
     sign_in(user)
-    skip 'Test not applicable in classic UI' unless Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
 
     visit project_path(project)
     open_duo_chat
diff --git a/ee/spec/features/duo_chat/user_opens_duo_chat_spec.rb b/ee/spec/features/duo_chat/user_opens_duo_chat_spec.rb
index 7ed16391bfe46e3acdadf70c1e3cfdef6a38c401..bbef8fe71e5979747fd2051bb117798bd6fa46ec 100644
--- a/ee/spec/features/duo_chat/user_opens_duo_chat_spec.rb
+++ b/ee/spec/features/duo_chat/user_opens_duo_chat_spec.rb
@@ -23,9 +23,6 @@
   describe 'opening Duo Chat' do
     before do
       visit project_path(project)
-
-      # close button for the popover
-      find_by_testid('close-button').click unless Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
     end
 
     it 'shows the Duo Chat button' do
@@ -36,37 +33,23 @@
       find('button.js-tanuki-bot-chat-toggle').click
       wait_for_requests
 
-      if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-        expect(page).to have_css('.ai-panel')
-      else
-        expect(page).to have_css('.duo-chat-container')
-      end
+      expect(page).to have_css('.ai-panel')
     end
   end
 
   describe 'closing Duo Chat' do
     before do
       visit project_path(project)
-      find_by_testid('close-button').click unless Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-
       find('button.js-tanuki-bot-chat-toggle').click
       wait_for_requests
     end
 
     it 'closes Duo Chat drawer when close button is clicked' do
-      if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-        if has_testid?('duo-chat-promo-callout-popover', wait: 1) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-          within_testid('duo-chat-promo-callout-popover') { find_by_testid('close-icon').click }
-        end
+      within_testid('duo-chat-promo-callout-popover') { find_by_testid('close-icon').click }
 
-        find_by_testid('content-container-collapse-button').click
+      find_by_testid('content-container-collapse-button').click
 
-        expect(page).not_to have_css('.ai-panel')
-      else
-        find_by_testid('chat-close-button').click
-
-        expect(page).not_to have_css('.duo-chat-container')
-      end
+      expect(page).not_to have_css('.ai-panel')
     end
   end
 
@@ -95,12 +78,7 @@
       find_by_testid('rca-duo-button').click
       wait_for_requests
 
-      if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-        expect(page).to have_css('.ai-panel')
-      else
-        expect(page).to have_css('.duo-chat-container')
-      end
-
+      expect(page).to have_css('.ai-panel')
       expect(page).to have_content(/troubleshoot/i)
     end
   end
diff --git a/ee/spec/features/epic_boards/epic_boards_sidebar_spec.rb b/ee/spec/features/epic_boards/epic_boards_sidebar_spec.rb
index c111358aba69d49903d8187bf245b636ee53cd39..8e7370715f294814b835a564df4b5823749d167c 100644
--- a/ee/spec/features/epic_boards/epic_boards_sidebar_spec.rb
+++ b/ee/spec/features/epic_boards/epic_boards_sidebar_spec.rb
@@ -35,11 +35,7 @@
 
     expect(page).to have_testid('work-item-drawer')
 
-    if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-      click_button 'Close panel'
-    else
-      click_button 'Close drawer'
-    end
+    click_button 'Close panel'
 
     expect(page).not_to have_testid('work-item-drawer')
   end
diff --git a/ee/spec/features/learn_gitlab_spec.rb b/ee/spec/features/learn_gitlab_spec.rb
index dc8439ac598ddd410d80970ff41c15c250cf428c..880cf655b01cee44b09c73c97dd26bd472a7169a 100644
--- a/ee/spec/features/learn_gitlab_spec.rb
+++ b/ee/spec/features/learn_gitlab_spec.rb
@@ -147,7 +147,7 @@
         it 'shows the duo chat promo popover after a page refresh' do
           page.refresh
 
-          find_by_testid('ai-chat-toggle').click if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
+          find_by_testid('ai-chat-toggle').click
           expect(page).to have_selector('[data-testid="duo-chat-promo-callout-popover"]')
         end
       end
@@ -162,7 +162,7 @@
         end
 
         it 'shows the duo chat promo popover' do
-          find_by_testid('ai-chat-toggle').click if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
+          find_by_testid('ai-chat-toggle').click
 
           expect(page).to have_selector('[data-testid="duo-chat-promo-callout-popover"]')
         end
diff --git a/ee/spec/features/projects/security/vulnerability_details_spec.rb b/ee/spec/features/projects/security/vulnerability_details_spec.rb
index ecba877803b826515104af23c5395739230e1c41..e3496cf2da1aaf537fa4a7751cdf62aafdb65237 100644
--- a/ee/spec/features/projects/security/vulnerability_details_spec.rb
+++ b/ee/spec/features/projects/security/vulnerability_details_spec.rb
@@ -151,7 +151,6 @@
   def visit_vulnerability_and_open_ai_dropdown(vulnerability)
     sign_in(user)
     visit vulnerability_url(vulnerability)
-    close_promotion_popover unless Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
 
     # Open the dropdown
     click_button 'Explain or Resolve with AI'
diff --git a/ee/spec/features/tanuki_bot_chat_spec.rb b/ee/spec/features/tanuki_bot_chat_spec.rb
index 88c1068d6f058ddb421a85d637cd2d7b74c820f4..2abfc3dcecf78417f85f8faccbc20f0b903c7c2f 100644
--- a/ee/spec/features/tanuki_bot_chat_spec.rb
+++ b/ee/spec/features/tanuki_bot_chat_spec.rb
@@ -40,13 +40,7 @@
 
       context "when opening the drawer from the breadcrumbs or side panel" do
         before do
-          if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-            find_by_testid('ai-chat-toggle').click
-          else
-            within_testid('top-bar') do
-              click_button('GitLab Duo Chat')
-            end
-          end
+          find_by_testid('ai-chat-toggle').click
         end
 
         it_behaves_like 'GitLab Duo drawer'
@@ -81,13 +75,7 @@
 
       context "when opening the drawer from the breadcrumbs or side panel" do
         before do
-          if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-            find_by_testid('ai-chat-toggle').click
-          else
-            within_testid('top-bar') do
-              click_button('GitLab Duo Chat')
-            end
-          end
+          find_by_testid('ai-chat-toggle').click
         end
 
         it_behaves_like 'GitLab Duo drawer'
diff --git a/ee/spec/features/user_interacts_with_explore_duo_core_banner_spec.rb b/ee/spec/features/user_interacts_with_explore_duo_core_banner_spec.rb
index 73bed308578725da30791c99b09fddfa8e4a24da..4be1513b2a6d00ae25bc8cffbeab6c258dcc2cd4 100644
--- a/ee/spec/features/user_interacts_with_explore_duo_core_banner_spec.rb
+++ b/ee/spec/features/user_interacts_with_explore_duo_core_banner_spec.rb
@@ -7,8 +7,6 @@
     it 'dismisses the banner when clicking the close button' do
       expect(page).to have_content(banner_content)
 
-      close_promotion_popover unless Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-
       page.within('.explore-duo-core-banner') do
         find('.gl-banner-close').click
         # Need to wait for requests or else the queries from this request will get
@@ -22,8 +20,6 @@
     it 'dismisses the banner when clicking the CTA' do
       expect(page).to have_content(banner_content)
 
-      close_promotion_popover unless Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-
       page.within('.explore-duo-core-banner') do
         click_link 'Explore GitLab Duo Core'
         wait_for_all_requests
diff --git a/ee/spec/features/work_items/issues/new/user_creates_issue_spec.rb b/ee/spec/features/work_items/issues/new/user_creates_issue_spec.rb
index 9ec1436c9ca209feb0d599898a4435d889329c50..2645396375e061a14d20bf125d0caa39fb491347 100644
--- a/ee/spec/features/work_items/issues/new/user_creates_issue_spec.rb
+++ b/ee/spec/features/work_items/issues/new/user_creates_issue_spec.rb
@@ -57,8 +57,7 @@
       end
 
       it 'has disabled GitLab Duo button' do
-        skip 'https://gitlab.com/gitlab-org/gitlab/-/issues/578218' if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-        expect(page).to have_button('GitLab Duo', disabled: true)
+        expect(find_by_testid('ai-chat-toggle')['aria-disabled']).to eq('true')
       end
     end
   end
diff --git a/ee/spec/features/work_items/list/user_interacts_with_drawer_spec.rb b/ee/spec/features/work_items/list/user_interacts_with_drawer_spec.rb
index 666a882be9b5002e9351229aaec57cd05c63cd29..c83c08786d9b7a0b9f6096ff7e68c8773df1b93b 100644
--- a/ee/spec/features/work_items/list/user_interacts_with_drawer_spec.rb
+++ b/ee/spec/features/work_items/list/user_interacts_with_drawer_spec.rb
@@ -71,161 +71,79 @@
     end
   end
 
-  context 'when project studio is disabled' do
-    context 'if user is signed in as developer' do
-      let(:issuable_container) { '[data-testid="issuable-container"]' }
+  context 'if user is signed in as developer' do
+    let(:issuable_container) { '[data-testid="issuable-container"]' }
 
-      before_all do
-        group.add_developer(user)
-      end
+    before_all do
+      group.add_developer(user)
+    end
 
-      context 'when accessing work item from project work item list' do
-        before do
-          stub_licensed_features(epics: true, issuable_health_status: true, iterations: true)
+    context 'when accessing work item from project work item list' do
+      before do
+        stub_licensed_features(epics: true, issuable_health_status: true, iterations: true)
 
-          sign_in(user)
+        sign_in(user)
 
-          visit project_work_items_path(project)
-          close_work_item_feedback_popover_if_present
+        visit project_work_items_path(project)
+        close_work_item_feedback_popover_if_present
 
-          first_card.click
+        first_card.click
 
-          wait_for_requests
-        end
-
-        include_examples 'updates weight of a work item on the list'
-        include_examples 'updates health status of a work item on the list'
-        include_examples 'updates iteration of a work item on the list'
+        wait_for_requests
       end
 
-      context 'when accessing work item from group work item list' do
-        before do
-          stub_licensed_features(epics: true, issuable_health_status: true, iterations: true)
-
-          sign_in(user)
+      include_examples 'updates weight of a work item on the list'
+      include_examples 'updates health status of a work item on the list'
+      include_examples 'updates iteration of a work item on the list'
+    end
 
-          visit group_work_items_path(group)
-          close_work_item_feedback_popover_if_present
+    context 'when accessing work item from group work item list' do
+      before do
+        stub_licensed_features(epics: true, issuable_health_status: true, iterations: true)
 
-          first_card.click
+        sign_in(user)
 
-          wait_for_requests
-        end
+        visit group_work_items_path(group)
+        close_work_item_feedback_popover_if_present
 
-        it_behaves_like 'work item drawer on the list page'
+        first_card.click
 
-        include_examples 'updates weight of a work item on the list'
-        include_examples 'updates health status of a work item on the list'
-        include_examples 'updates iteration of a work item on the list'
+        wait_for_requests
       end
 
-      context 'when accessing work item from group epics list' do
-        before do
-          stub_feature_flags(work_item_planning_view: false)
-          stub_licensed_features(epics: true, issuable_health_status: true, iterations: true)
-
-          sign_in(user)
-
-          visit group_epics_path(group)
-          close_work_item_feedback_popover_if_present
+      it_behaves_like 'work item drawer on the list page'
 
-          first_card.click
-
-          wait_for_requests
-        end
-
-        it_behaves_like 'work item drawer on the list page' do
-          let(:issue) { epic }
-          let(:label) { label_group }
-          let(:milestone) { milestone_group }
-        end
-
-        it_behaves_like 'updates health status of a work item on the list' do
-          let(:issue) { epic }
-        end
+      context 'with quarantine', quarantine: 'https://gitlab.com/gitlab-org/gitlab/-/issues/570546' do
+        include_examples 'updates weight of a work item on the list'
       end
-    end
-  end
 
-  context 'when project studio is enabled' do
-    before do
-      skip 'Test not applicable in classic UI' unless Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
+      include_examples 'updates health status of a work item on the list'
+      include_examples 'updates iteration of a work item on the list'
     end
 
-    context 'if user is signed in as developer' do
-      let(:issuable_container) { '[data-testid="issuable-container"]' }
-
-      before_all do
-        group.add_developer(user)
-      end
-
-      context 'when accessing work item from project work item list' do
-        before do
-          stub_licensed_features(epics: true, issuable_health_status: true, iterations: true)
-
-          sign_in(user)
+    context 'when accessing work item from group epics list' do
+      before do
+        stub_feature_flags(work_item_planning_view: false)
+        stub_licensed_features(epics: true, issuable_health_status: true, iterations: true)
 
-          visit project_work_items_path(project)
-          close_work_item_feedback_popover_if_present
+        sign_in(user)
 
-          first_card.click
+        visit group_epics_path(group)
+        close_work_item_feedback_popover_if_present
 
-          wait_for_requests
-        end
+        first_card.click
 
-        include_examples 'updates weight of a work item on the list'
-        include_examples 'updates health status of a work item on the list'
-        include_examples 'updates iteration of a work item on the list'
+        wait_for_requests
       end
 
-      context 'when accessing work item from group work item list' do
-        before do
-          stub_licensed_features(epics: true, issuable_health_status: true, iterations: true)
-
-          sign_in(user)
-
-          visit group_work_items_path(group)
-          close_work_item_feedback_popover_if_present
-
-          first_card.click
-
-          wait_for_requests
-        end
-
-        it_behaves_like 'work item drawer on the list page'
-
-        context 'with quarantine', quarantine: 'https://gitlab.com/gitlab-org/gitlab/-/issues/570546' do
-          include_examples 'updates weight of a work item on the list'
-        end
-
-        include_examples 'updates health status of a work item on the list'
-        include_examples 'updates iteration of a work item on the list'
+      it_behaves_like 'work item drawer on the list page' do
+        let(:issue) { epic }
+        let(:label) { label_group }
+        let(:milestone) { milestone_group }
       end
 
-      context 'when accessing work item from group epics list' do
-        before do
-          stub_feature_flags(work_item_planning_view: false)
-          stub_licensed_features(epics: true, issuable_health_status: true, iterations: true)
-
-          sign_in(user)
-
-          visit group_epics_path(group)
-          close_work_item_feedback_popover_if_present
-
-          first_card.click
-
-          wait_for_requests
-        end
-
-        it_behaves_like 'work item drawer on the list page' do
-          let(:issue) { epic }
-          let(:label) { label_group }
-          let(:milestone) { milestone_group }
-        end
-
-        it_behaves_like 'updates health status of a work item on the list' do
-          let(:issue) { epic }
-        end
+      it_behaves_like 'updates health status of a work item on the list' do
+        let(:issue) { epic }
       end
     end
   end
diff --git a/ee/spec/helpers/ee/nav_helper_spec.rb b/ee/spec/helpers/ee/nav_helper_spec.rb
index 22b394eac531fb43a4a1a93b1ada60271c51b9e4..9128bb40a841770956d47f4c8b17b85fa830c212 100644
--- a/ee/spec/helpers/ee/nav_helper_spec.rb
+++ b/ee/spec/helpers/ee/nav_helper_spec.rb
@@ -30,41 +30,4 @@
       end
     end
   end
-
-  describe '#top_bar_duo_button_enabled?' do
-    before do
-      skip 'Test not applicable in new UI' if Users::ProjectStudio.enabled_for_user?(user)
-    end
-
-    context 'when TanukiBot.show_breadcrumbs_entry_point? returns true' do
-      before do
-        allow(::Gitlab::Llm::TanukiBot).to receive(:show_breadcrumbs_entry_point?).with(user: user).and_return(true)
-      end
-
-      it 'returns true' do
-        expect(helper).to be_top_bar_duo_button_enabled
-      end
-    end
-
-    context 'when TanukiBot.show_breadcrumbs_entry_point? returns false' do
-      before do
-        allow(::Gitlab::Llm::TanukiBot).to receive(:show_breadcrumbs_entry_point?).with(user: user).and_return(false)
-      end
-
-      it 'returns false' do
-        expect(helper).not_to be_top_bar_duo_button_enabled
-      end
-    end
-
-    context 'when current_user is nil' do
-      before do
-        allow(helper).to receive(:current_user).and_return(nil)
-        allow(::Gitlab::Llm::TanukiBot).to receive(:show_breadcrumbs_entry_point?).with(user: nil).and_return(false)
-      end
-
-      it 'returns false' do
-        expect(helper).not_to be_top_bar_duo_button_enabled
-      end
-    end
-  end
 end
diff --git a/ee/spec/views/layouts/_page.html.haml_spec.rb b/ee/spec/views/layouts/_page.html.haml_spec.rb
deleted file mode 100644
index d01cdb6c2839e374864d113488e4e90d3d78180d..0000000000000000000000000000000000000000
--- a/ee/spec/views/layouts/_page.html.haml_spec.rb
+++ /dev/null
@@ -1,52 +0,0 @@
-# frozen_string_literal: true
-
-require 'spec_helper'
-
-RSpec.describe 'layouts/_page', feature_category: :global_search do
-  let_it_be(:user) { build_stubbed(:user) }
-  let_it_be(:project) { build_stubbed(:project) }
-
-  describe 'EE tanuki_bot_chat' do
-    before do
-      skip 'Test not applicable in new UI' if Users::ProjectStudio.enabled_for_user?(user)
-      assign(:project, project)
-      allow(view).to receive_messages(current_user: user, current_user_mode: Gitlab::Auth::CurrentUserMode.new(user))
-    end
-
-    describe 'when project is nil' do
-      let_it_be(:project) { nil }
-
-      it 'does not render #js-tanuki-bot-chat-app' do
-        render
-
-        expect(rendered).not_to have_selector('#js-tanuki-bot-chat-app')
-      end
-    end
-
-    describe 'when ::Gitlab::Llm::TanukiBot.enabled_for?(user) is true' do
-      before do
-        allow(::Gitlab::Llm::TanukiBot).to receive(:enabled_for?)
-          .with(user: user, container: nil).and_return(true)
-      end
-
-      it 'renders #js-tanuki-bot-chat-app' do
-        render
-
-        expect(rendered).to have_selector('#js-tanuki-bot-chat-app')
-      end
-    end
-
-    describe 'when ::Gitlab::Llm::TanukiBot.enabled_for?(user) is false' do
-      before do
-        allow(::Gitlab::Llm::TanukiBot).to receive(:enabled_for?)
-          .with(user: user, container: nil).and_return(false)
-      end
-
-      it 'does not render #js-tanuki-bot-chat-app' do
-        render
-
-        expect(rendered).not_to have_selector('#js-tanuki-bot-chat-app')
-      end
-    end
-  end
-end
diff --git a/ee/spec/views/layouts/_tanuki_bot_chat.html.haml_spec.rb b/ee/spec/views/layouts/_tanuki_bot_chat.html.haml_spec.rb
index fb312256000b2ed4268c8add3a9b2af1edb2fa08..a5900dee0ffdc7a762aa37dd2977e7494a631de1 100644
--- a/ee/spec/views/layouts/_tanuki_bot_chat.html.haml_spec.rb
+++ b/ee/spec/views/layouts/_tanuki_bot_chat.html.haml_spec.rb
@@ -73,40 +73,4 @@
       expect(rendered).not_to have_css("#js-duo-agentic-chat-app[data-namespace-id]")
     end
   end
-
-  describe 'Tanuki bot chat app' do
-    before do
-      skip 'Test not applicable in new UI' if Users::ProjectStudio.enabled_for_user?(current_user)
-    end
-
-    it 'includes the root_namespace_id in the data attributes' do
-      render
-
-      expect(rendered).to have_css("#js-tanuki-bot-chat-app[data-root-namespace-id='test_root_namespace_id']")
-    end
-
-    context 'when AmazonQ is enabled' do
-      before do
-        allow(::Ai::AmazonQ).to receive(:enabled?).and_return(true)
-      end
-
-      it 'sets the correct chat title' do
-        render
-
-        expect(rendered).to have_css("#js-tanuki-bot-chat-app[data-chat-title='GitLab Duo Chat with Amazon Q']")
-      end
-    end
-
-    context 'when AmazonQ is not enabled' do
-      before do
-        allow(::Ai::AmazonQ).to receive(:enabled?).and_return(false)
-      end
-
-      it 'sets the correct chat title' do
-        render
-
-        expect(rendered).to have_css("#js-tanuki-bot-chat-app[data-chat-title='GitLab Duo Chat']")
-      end
-    end
-  end
 end
diff --git a/lib/gitlab/gon_helper.rb b/lib/gitlab/gon_helper.rb
index ff4b60d2c0a13b0755e87ac082ae1f6d55885256..3dbcf1b23cbbcbee89b60b3de2c52bd85dfa93fd 100644
--- a/lib/gitlab/gon_helper.rb
+++ b/lib/gitlab/gon_helper.rb
@@ -106,13 +106,12 @@ def add_gon_feature_flags
       push_frontend_feature_flag(:glql_work_items, current_user)
       push_frontend_feature_flag(:glql_aggregation, current_user, type: :wip)
       push_frontend_feature_flag(:glql_typescript, current_user, type: :wip)
-      push_frontend_feature_flag(:paneled_view, current_user)
       push_frontend_feature_flag(:archive_group)
       push_frontend_feature_flag(:accessible_loading_button, current_user)
       push_frontend_feature_flag(:allow_iframes_in_markdown, current_user)
 
       # Expose the Project Studio user preference as if it were a feature flag
-      push_force_frontend_feature_flag(:project_studio_enabled, Users::ProjectStudio.new(current_user).enabled?)
+      push_force_frontend_feature_flag(:project_studio_enabled, true)
     end
 
     # Exposes the state of a feature flag to the frontend code.
diff --git a/spec/features/boards/sidebar_spec.rb b/spec/features/boards/sidebar_spec.rb
index ce24eda655840e6ef7690e2a229703471beea459..47bb36e72aa430a36d7f2ee714b753791bbda486 100644
--- a/spec/features/boards/sidebar_spec.rb
+++ b/spec/features/boards/sidebar_spec.rb
@@ -5,44 +5,26 @@
 RSpec.describe 'Project issue boards sidebar', :js, feature_category: :portfolio_management do
   include BoardHelpers
 
-  let_it_be(:user)    { create(:user) }
-  let_it_be(:group)   { create(:group, :public) }
+  let_it_be(:user) { create(:user) }
+  let_it_be(:group) { create(:group, :public) }
   let_it_be(:project) { create(:project, :public, namespace: group) }
-  let_it_be(:board)   { create(:board, project: project) }
-  let_it_be(:label)   { create(:label, project: project, name: 'Label') }
-  let_it_be(:list)    { create(:list, board: board, label: label, position: 0) }
+  let_it_be(:board) { create(:board, project: project) }
+  let_it_be(:label) { create(:label, project: project, name: 'Label') }
+  let_it_be(:list) { create(:list, board: board, label: label, position: 0) }
 
   let_it_be(:issue, reload: true) { create(:issue, project: project, relative_position: 1) }
 
   before do
     project.add_maintainer(user)
-  end
-
-  context 'when project studio is enabled' do
-    before do
-      skip 'Test not applicable in classic UI' unless Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-      sign_in(user)
+    sign_in(user)
 
-      visit project_board_path(project, board)
-      click_button 'Collapse sidebar' # otherwise panel opens as drawer and intercepts clicks
+    visit project_board_path(project, board)
+    click_button 'Collapse sidebar' # otherwise panel opens as drawer and intercepts clicks
 
-      wait_for_requests
-    end
-
-    it_behaves_like 'work item drawer on the boards'
+    wait_for_requests
   end
 
-  context 'when project studio is disabled' do
-    before do
-      sign_in(user)
-
-      visit project_board_path(project, board)
-
-      wait_for_requests
-    end
-
-    it_behaves_like 'work item drawer on the boards'
-  end
+  it_behaves_like 'work item drawer on the boards'
 
   def first_card
     find('[data-testid="board-list"]:nth-child(1)').first("[data-testid='board-card']")
diff --git a/spec/features/global_search_spec.rb b/spec/features/global_search_spec.rb
index 12b731a30dc6190966e98804fb8d43e835325966..69a7e714ea82e002adfe8a70438a4ce48495a102 100644
--- a/spec/features/global_search_spec.rb
+++ b/spec/features/global_search_spec.rb
@@ -17,11 +17,7 @@
 
   shared_examples 'header search' do
     it 'renders search button' do
-      if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-        expect(page).to have_selector('[data-testid="super-topbar-search-button"]')
-      else
-        expect(page).to have_selector('[data-testid="super-sidebar-search-button"]')
-      end
+      expect(page).to have_selector('[data-testid="super-topbar-search-button"]')
     end
 
     it 'opens search modal when shortcut "s" is pressed' do
diff --git a/spec/features/groups/milestone_spec.rb b/spec/features/groups/milestone_spec.rb
index 49652a8c61a50fb91a2a1f8ed10a9cebda7268a8..f88db64430e250cbca04799070e66995d5743a4b 100644
--- a/spec/features/groups/milestone_spec.rb
+++ b/spec/features/groups/milestone_spec.rb
@@ -51,10 +51,6 @@
 
       click_button 'Create milestone'
 
-      if page.has_css?('.milestone-sidebar .js-sidebar-expand', wait: 0) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-        find('.milestone-sidebar .js-sidebar-expand').click
-      end
-
       expect(find('.start_date')).to have_content(Date.today.at_beginning_of_month.strftime('%b %-d, %Y'))
     end
 
diff --git a/spec/features/incidents/incident_details_spec.rb b/spec/features/incidents/incident_details_spec.rb
index f80df4e0b6ce964a35c10d36bacd880c4c6d2324..f04701bd88a5f451e90395145ea0bc701b5c88cd 100644
--- a/spec/features/incidents/incident_details_spec.rb
+++ b/spec/features/incidents/incident_details_spec.rb
@@ -216,10 +216,6 @@ def current_status
   end
 
   def find_in_page_or_panel_by_scrolling(selector, **options)
-    if Users::ProjectStudio.enabled_for_user?(developer) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-      find_in_panel_by_scrolling(selector, **options)
-    else
-      find_by_scrolling(selector, **options)
-    end
+    find_in_panel_by_scrolling(selector, **options)
   end
 end
diff --git a/spec/features/merge_request/batch_comments_spec.rb b/spec/features/merge_request/batch_comments_spec.rb
index 2c1c7069a2a39864984dff8547a329f6b39e5700..0ef17d6bc803956f7bff512872764d007048bcca 100644
--- a/spec/features/merge_request/batch_comments_spec.rb
+++ b/spec/features/merge_request/batch_comments_spec.rb
@@ -70,11 +70,7 @@
     wait_for_requests
 
     # make sure comment form is in view
-    if Users::ProjectStudio.enabled_for_user?(user)
-      execute_script("document.querySelector('.js-static-panel-inner').scrollBy(0, 200)")
-    else
-      execute_script("window.scrollBy(0, 200)")
-    end
+    execute_script("document.querySelector('.js-static-panel-inner').scrollBy(0, 200)")
 
     write_comment(text: 'Testing update', button_text: 'Save comment')
 
@@ -328,10 +324,6 @@ def write_reply_to_discussion(button_text: 'Start a review', text: 'Line is wron
   end
 
   def find_in_page_or_panel_by_scrolling(selector, **options)
-    if Users::ProjectStudio.enabled_for_user?(user)
-      find_in_panel_by_scrolling(selector, **options)
-    else
-      find_by_scrolling(selector, **options)
-    end
+    find_in_panel_by_scrolling(selector, **options)
   end
 end
diff --git a/spec/features/merge_request/user_comments_on_diff_spec.rb b/spec/features/merge_request/user_comments_on_diff_spec.rb
index 5e62427afdd8e7cb84cf77dd7e3be549e13c5f8d..35926408cfc28c9cc2d5d2b728171dca10c98d81 100644
--- a/spec/features/merge_request/user_comments_on_diff_spec.rb
+++ b/spec/features/merge_request/user_comments_on_diff_spec.rb
@@ -95,11 +95,7 @@
           expect(find_in_page_or_panel_by_scrolling(".js-discussion-container", index: 0)).to have_content('Line is correct')
 
           # Check the same comments in the side-by-side view.
-          if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-            page.execute_script "document.querySelector('.js-static-panel-inner').scrollTo(0,0)"
-          else
-            execute_script "window.scrollTo(0,0)"
-          end
+          page.execute_script "document.querySelector('.js-static-panel-inner').scrollTo(0,0)"
 
           find('.js-show-diff-settings').click
           find_by_testid('listbox-item-parallel').click
@@ -290,11 +286,7 @@ def add_comment(start_line)
 
   def find_in_page_or_panel_by_scrolling(selector, index: nil, **options)
     if index.nil? # rubocop:disable RSpec/AvoidConditionalStatements -- This is to make index param optional
-      if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-        find_in_panel_by_scrolling(selector, **options)
-      else
-        find_by_scrolling(selector, **options)
-      end
+      find_in_panel_by_scrolling(selector, **options)
     else
       all(selector, **options)[index]
     end
diff --git a/spec/features/merge_request/user_comments_on_whitespace_hidden_diff_spec.rb b/spec/features/merge_request/user_comments_on_whitespace_hidden_diff_spec.rb
index 6fb95505c4598ab042d1ce45ea73013135d47e85..bd2b3b2dec54a960d2e3bb5a2d54e0947a8bff5f 100644
--- a/spec/features/merge_request/user_comments_on_whitespace_hidden_diff_spec.rb
+++ b/spec/features/merge_request/user_comments_on_whitespace_hidden_diff_spec.rb
@@ -167,10 +167,6 @@ def hide_whitespace
   end
 
   def find_in_page_or_panel_by_scrolling(selector, **options)
-    if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-      find_in_panel_by_scrolling(selector, **options)
-    else
-      find_by_scrolling(selector, **options)
-    end
+    find_in_panel_by_scrolling(selector, **options)
   end
 end
diff --git a/spec/features/merge_request/user_posts_diff_notes_spec.rb b/spec/features/merge_request/user_posts_diff_notes_spec.rb
index 1ad7fec13f53d1f4f0733d42b32a9194cd46a91f..c87e4fe1ddd3504b2f19d04eaffc5562815deea6 100644
--- a/spec/features/merge_request/user_posts_diff_notes_spec.rb
+++ b/spec/features/merge_request/user_posts_diff_notes_spec.rb
@@ -286,10 +286,6 @@ def assert_form_is_reset
   end
 
   def find_in_page_or_panel_by_scrolling(selector, **options)
-    if Users::ProjectStudio.enabled_for_user?(user)
-      find_in_panel_by_scrolling(selector, **options)
-    else
-      find_by_scrolling(selector, **options)
-    end
+    find_in_panel_by_scrolling(selector, **options)
   end
 end
diff --git a/spec/features/merge_request/user_resolves_diff_notes_and_discussions_resolve_spec.rb b/spec/features/merge_request/user_resolves_diff_notes_and_discussions_resolve_spec.rb
index a9bdfc34e5e82b3c3e308a0f2c8ab8fa786ca652..e12175a35f0311e0a8661201282dd511b903fb38 100644
--- a/spec/features/merge_request/user_resolves_diff_notes_and_discussions_resolve_spec.rb
+++ b/spec/features/merge_request/user_resolves_diff_notes_and_discussions_resolve_spec.rb
@@ -334,11 +334,7 @@
           page.find('.discussion-next-btn').click
         end
 
-        if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-          expect(page.evaluate_script("document.querySelector('.js-static-panel-inner').scrollTop")).to be > 0
-        else
-          expect(page.evaluate_script("window.pageYOffset")).to be > 0
-        end
+        expect(page.evaluate_script("document.querySelector('.js-static-panel-inner').scrollTop")).to be > 0
       end
 
       it 'updates updated text after resolving note' do
diff --git a/spec/features/merge_request/user_scrolls_to_note_on_load_spec.rb b/spec/features/merge_request/user_scrolls_to_note_on_load_spec.rb
index eab42268485df6a7baf57545cba2e4ed1631e580..f97b60bbe0100668a9e7c7f1b4d378800a2507a9 100644
--- a/spec/features/merge_request/user_scrolls_to_note_on_load_spec.rb
+++ b/spec/features/merge_request/user_scrolls_to_note_on_load_spec.rb
@@ -22,19 +22,11 @@
     expect(page).to have_selector(fragment_id.to_s)
     expect(find(fragment_id).visible?).to eq true
 
-    if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-      panel_scroll_top = page.evaluate_script("document.querySelector('.js-static-panel-inner').scrollTop")
-      fragment_position_top = page.evaluate_script("Math.round(document.querySelector('#{fragment_id}').getBoundingClientRect().top + document.querySelector('.js-static-panel-inner').scrollTop)")
-
-      expect(fragment_position_top).to be >= panel_scroll_top
-      expect(page.evaluate_script("document.querySelector('.js-static-panel-inner').scrollTop")).to be > 0
-    else
-      page_scroll_y = page.evaluate_script("window.scrollY")
-      fragment_position_top = page.evaluate_script("Math.round(document.querySelector('#{fragment_id}').getBoundingClientRect().top + window.pageYOffset)")
-
-      expect(fragment_position_top).to be >= page_scroll_y
-      expect(page.evaluate_script("window.pageYOffset")).to be > 0
-    end
+    panel_scroll_top = page.evaluate_script("document.querySelector('.js-static-panel-inner').scrollTop")
+    fragment_position_top = page.evaluate_script("Math.round(document.querySelector('#{fragment_id}').getBoundingClientRect().top + document.querySelector('.js-static-panel-inner').scrollTop)")
+
+    expect(fragment_position_top).to be >= panel_scroll_top
+    expect(page.evaluate_script("document.querySelector('.js-static-panel-inner').scrollTop")).to be > 0
   end
 
   it 'renders un-collapsed notes with diff' do
@@ -42,11 +34,7 @@
 
     visit "#{project_merge_request_path(project, merge_request)}#{fragment_id}"
 
-    if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-      page.execute_script "document.querySelector('.js-static-panel-inner').scrollTo(0,0)"
-    else
-      page.execute_script "window.scrollTo(0,0)"
-    end
+    page.execute_script "document.querySelector('.js-static-panel-inner').scrollTo(0,0)"
 
     note_element = find(fragment_id)
     note_container = note_element.ancestor('.js-discussion-container')
diff --git a/spec/features/merge_request/user_sees_avatar_on_diff_notes_spec.rb b/spec/features/merge_request/user_sees_avatar_on_diff_notes_spec.rb
index 8cb078f4c549405198f47ca73ed31a4c987d5df9..f4eb4ca27047f0d8ae708a22b3c7acff01615252 100644
--- a/spec/features/merge_request/user_sees_avatar_on_diff_notes_spec.rb
+++ b/spec/features/merge_request/user_sees_avatar_on_diff_notes_spec.rb
@@ -126,11 +126,7 @@
 
       it 'removes avatar when note is deleted',
         quarantine: 'https://gitlab.com/gitlab-org/quality/test-failure-issues/-/issues/4253' do
-        if Users::ProjectStudio.enabled_for_user?(user)
-          open_more_actions_dropdown_in_panel(note)
-        else
-          open_more_actions_dropdown(note)
-        end
+        open_more_actions_dropdown_in_panel(note)
 
         accept_gl_confirm(button_text: 'Delete comment') do
           find(".note-row-#{note.id} .js-note-delete").click
@@ -211,10 +207,6 @@ def find_line(line_code)
   end
 
   def find_in_page_or_panel_by_scrolling(selector, **options)
-    if Users::ProjectStudio.enabled_for_user?(user)
-      find_in_panel_by_scrolling(selector, **options)
-    else
-      find_by_scrolling(selector, **options)
-    end
+    find_in_panel_by_scrolling(selector, **options)
   end
 end
diff --git a/spec/features/merge_request/user_sees_diff_spec.rb b/spec/features/merge_request/user_sees_diff_spec.rb
index 2621f4c1057dedb9533aab9995515f4e31373893..6a29912b3e7e75048e30d4a5c428c44089003b6c 100644
--- a/spec/features/merge_request/user_sees_diff_spec.rb
+++ b/spec/features/merge_request/user_sees_diff_spec.rb
@@ -208,11 +208,7 @@ def create_file(branch_name, file_name, content)
     end
 
     def find_in_page_or_panel_by_scrolling(selector, **options)
-      if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-        find_in_panel_by_scrolling(selector, **options)
-      else
-        find_by_scrolling(selector, **options)
-      end
+      find_in_panel_by_scrolling(selector, **options)
     end
   end
 end
diff --git a/spec/features/merge_request/user_sees_versions_spec.rb b/spec/features/merge_request/user_sees_versions_spec.rb
index d1d0e0805089ed3225aac597b213919e24ecd8c5..baec36d9051ddbf36e18c1ee7d619fca517365c9 100644
--- a/spec/features/merge_request/user_sees_versions_spec.rb
+++ b/spec/features/merge_request/user_sees_versions_spec.rb
@@ -30,11 +30,7 @@
         line_code_element = page.find('.diff-grid-row', text: line_text)
         # scrolling to element's bottom is required in order for .hover action to work
         # otherwise, the element could be hidden underneath a sticky header
-        if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-          scroll_to_panel_elements_bottom(line_code_element)
-        else
-          scroll_to_elements_bottom(line_code_element)
-        end
+        scroll_to_panel_elements_bottom(line_code_element)
 
         line_code_element.hover
         find_by_testid('left-comment-button', visible: true).click
@@ -286,10 +282,6 @@
   end
 
   def find_in_page_or_panel_by_scrolling(selector, **options)
-    if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-      find_in_panel_by_scrolling(selector, **options)
-    else
-      find_by_scrolling(selector, **options)
-    end
+    find_in_panel_by_scrolling(selector, **options)
   end
 end
diff --git a/spec/features/merge_request/user_suggests_changes_on_diff_spec.rb b/spec/features/merge_request/user_suggests_changes_on_diff_spec.rb
index 9b9db16f9a8a954077c83204dd6a23c0fefc7a4f..a411fa6c2173323694bce50196f415a2a3305809 100644
--- a/spec/features/merge_request/user_suggests_changes_on_diff_spec.rb
+++ b/spec/features/merge_request/user_suggests_changes_on_diff_spec.rb
@@ -22,9 +22,6 @@ def expect_suggestion_has_content(element, expected_changing_content, expected_s
   let(:user) { create(:user) }
 
   before do
-    # -- temporary Project Studio rollout
-    skip 'Test not applicable in classic UI' unless Users::ProjectStudio.enabled_for_user?(user)
-
     project.add_maintainer(user)
     sign_in(user)
 
@@ -451,10 +448,6 @@ def diffs_metadata
   end
 
   def find_in_page_or_panel_by_scrolling(selector, **options)
-    if Users::ProjectStudio.enabled_for_user?(user)
-      find_in_panel_by_scrolling(selector, **options)
-    else
-      find_by_scrolling(selector, **options)
-    end
+    find_in_panel_by_scrolling(selector, **options)
   end
 end
diff --git a/spec/features/milestone_spec.rb b/spec/features/milestone_spec.rb
index b507e89ee3b7f8552b06b9698c789ed55aa6da6c..620e966938ed1fd619b9b2af87e85314e64ff65d 100644
--- a/spec/features/milestone_spec.rb
+++ b/spec/features/milestone_spec.rb
@@ -81,10 +81,6 @@
 
       wait_for_requests
 
-      if page.has_css?('.milestone-sidebar .js-sidebar-expand', wait: 0) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-        find('.milestone-sidebar .js-sidebar-expand').click
-      end
-
       within_testid('noTrackingPane') do
         expect(page).to have_content 'No estimate or time spent'
       end
@@ -103,10 +99,6 @@
 
       wait_for_requests
 
-      if page.has_css?('.milestone-sidebar .js-sidebar-expand', wait: 0) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-        find('.milestone-sidebar .js-sidebar-expand').click
-      end
-
       within_testid('spentOnlyPane') do
         expect(page).to have_content 'Spent: 3h'
       end
diff --git a/spec/features/projects/ci/editor_spec.rb b/spec/features/projects/ci/editor_spec.rb
index f920d618f98d02c5848f13a8a872a011aa3b270f..26e620eec7ec65fe7e86f770d44872c024f29aed 100644
--- a/spec/features/projects/ci/editor_spec.rb
+++ b/spec/features/projects/ci/editor_spec.rb
@@ -216,7 +216,7 @@
   describe 'Branch Switcher' do
     def switch_to_branch(branch)
       # close button for the popover
-      find_by_testid('close-button').click if page.has_css?('[data-testid="close-button"]', wait: 0) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
+      find_by_testid('close-button').click
       within_testid 'branch-selector' do
         toggle_listbox
         select_listbox_item(branch, exact_text: true)
diff --git a/spec/features/projects/repository/file_tree_browser_spec.rb b/spec/features/projects/repository/file_tree_browser_spec.rb
index ea134d970bf313182a52975629260111894aedd1..483125bcbf3d736fc6a5bd96320dab5183ececa5 100644
--- a/spec/features/projects/repository/file_tree_browser_spec.rb
+++ b/spec/features/projects/repository/file_tree_browser_spec.rb
@@ -20,20 +20,12 @@
 
   describe 'basic functionality' do
     it 'shows and hides the file tree browser' do
-      if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-        expect(page).to have_css('.file-tree-browser-peek')
-      else
-        expect(page).to have_css('.file-tree-browser-expanded')
-      end
+      expect(page).to have_css('.file-tree-browser-peek')
 
       click_button 'Hide file tree browser'
       wait_for_requests
 
-      if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-        expect(page).not_to have_css('.file-tree-browser-peek')
-      else
-        expect(page).not_to have_css('.file-tree-browser-expanded')
-      end
+      expect(page).not_to have_css('.file-tree-browser-peek')
     end
 
     it 'displays files and directories' do
@@ -68,8 +60,8 @@
     it 'expands parent directories when navigating directly to a nested file' do
       visit project_blob_path(project, "#{project.default_branch}/files/ruby/popen.rb")
       wait_for_requests
-      # File tree starts collapsed in Project Studio
-      click_button('Show file tree browser') if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
+      # File tree starts collapsed
+      click_button('Show file tree browser')
 
       within('.file-tree-browser') do
         # Should auto-expand parent directories
diff --git a/spec/features/projects/show/user_sees_collaboration_links_spec.rb b/spec/features/projects/show/user_sees_collaboration_links_spec.rb
index e4364e296a96c4431abaacff070f73f5159d1eec..38dcb8d4d62ad664000c38038d331664964cc40b 100644
--- a/spec/features/projects/show/user_sees_collaboration_links_spec.rb
+++ b/spec/features/projects/show/user_sees_collaboration_links_spec.rb
@@ -18,9 +18,7 @@ def find_new_menu_toggle
   end
 
   def within_navigation_panel(&block)
-    # We search for .super-topbar to account for the Project Studio UI
-    selector = page.has_css?('.super-topbar') ? '.super-topbar' : '[data-testid="super-sidebar"]' # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-    within(selector, &block)
+    within('.super-topbar', &block)
   end
 
   context 'with developer user' do
diff --git a/spec/features/projects/snippets/user_updates_snippet_spec.rb b/spec/features/projects/snippets/user_updates_snippet_spec.rb
index d8d3b204f34e632d33516196bc0cf4eb4566261f..e7ab39a4f35e95cd5cadd9ed84f14d00b2feacfe 100644
--- a/spec/features/projects/snippets/user_updates_snippet_spec.rb
+++ b/spec/features/projects/snippets/user_updates_snippet_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe 'Projects > Snippets > User updates a snippet', :js, feature_category: :source_code_management do
+RSpec.describe 'Projects > Snippets > User updates a snippet', :js, feature_category: :source_code_management, quarantine: 'https://gitlab.com/gitlab-org/gitlab/-/issues/580358' do
   include Features::SnippetSpecHelpers
 
   let_it_be(:user) { create(:user) }
@@ -10,7 +10,6 @@
   let_it_be(:snippet, reload: true) { create(:project_snippet, :repository, project: project, author: user) }
 
   before do
-    skip 'Test skipped when Project Studio enabled as page load can timeout - https://gitlab.com/gitlab-org/gitlab/-/issues/580358' if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
     project.add_maintainer(user)
     sign_in(user)
 
diff --git a/spec/features/projects/user_sees_sidebar_spec.rb b/spec/features/projects/user_sees_sidebar_spec.rb
index 14b084f1e6034dffe902493e1acb5c0449e5c7f1..06f1cbd57451b16713ed03e58fe8e7dfd90ec337 100644
--- a/spec/features/projects/user_sees_sidebar_spec.rb
+++ b/spec/features/projects/user_sees_sidebar_spec.rb
@@ -19,27 +19,16 @@
         expect(page).to have_selector('[data-testid="super-sidebar-collapse-button"]', visible: :visible)
         find_by_testid('super-sidebar-collapse-button').click
 
-        if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-          expect(find_by_testid('super-sidebar')[:class]).to include('super-sidebar-is-icon-only')
-        else
-          expect(page).to have_selector('[data-testid="super-sidebar-collapse-button"]', visible: :hidden)
-        end
+        expect(find_by_testid('super-sidebar')[:class]).to include('super-sidebar-is-icon-only')
       end
     end
 
     shared_examples 'has a collapsed nav sidebar' do
       it 'has a collapsed nav sidebar on load that can be expanded' do
-        if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-          expect(page).not_to have_selector('[data-testid="super-sidebar-collapse-button"]')
-
-          find_by_testid('super-sidebar-toggle-button').click
-          expect(page).to have_selector('[data-testid="nav-container"]', visible: :visible)
-        else
-          expect(page).to have_selector('[data-testid="super-sidebar-collapse-button"]', visible: :hidden)
+        expect(page).not_to have_selector('[data-testid="super-sidebar-collapse-button"]')
 
-          page.find('.js-super-sidebar-toggle-expand').click
-          expect(page).to have_selector('[data-testid="super-sidebar-collapse-button"]', visible: :visible)
-        end
+        find_by_testid('super-sidebar-toggle-button').click
+        expect(page).to have_selector('[data-testid="nav-container"]', visible: :visible)
       end
     end
 
diff --git a/spec/features/snippets/user_edits_snippet_spec.rb b/spec/features/snippets/user_edits_snippet_spec.rb
index 43112ace16ec17754445c831c1cd87a6716f02c6..3a615b0496508b87d864aa29bcdee5cb84c348bd 100644
--- a/spec/features/snippets/user_edits_snippet_spec.rb
+++ b/spec/features/snippets/user_edits_snippet_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe 'User edits snippet', :js, feature_category: :source_code_management do
+RSpec.describe 'User edits snippet', :js, feature_category: :source_code_management, quarantine: 'https://gitlab.com/gitlab-org/gitlab/-/issues/580358' do
   include DropzoneHelper
   include Features::SnippetSpecHelpers
 
@@ -21,7 +21,6 @@
   end
 
   before do
-    skip 'Test skipped when Project Studio enabled as page load can timeout - https://gitlab.com/gitlab-org/gitlab/-/issues/580358' if Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
     sign_in(user)
 
     visit edit_snippet_path(snippet)
diff --git a/spec/features/work_items/list/user_interacts_with_drawer_spec.rb b/spec/features/work_items/list/user_interacts_with_drawer_spec.rb
index cc2e6141d3fd932f473201ee6c1c0d9ff5e3782f..94500717236571e4378ea7c5893efcdcbe2907e8 100644
--- a/spec/features/work_items/list/user_interacts_with_drawer_spec.rb
+++ b/spec/features/work_items/list/user_interacts_with_drawer_spec.rb
@@ -13,142 +13,68 @@
   let_it_be(:label) { create(:label, project: project, title: "testing-label") }
   let_it_be(:milestone) { create(:milestone, project: project) }
 
-  context 'when project studio is enabled' do
-    before do
-      skip 'Test not applicable in classic UI' unless Users::ProjectStudio.enabled_for_user?(user) # rubocop:disable RSpec/AvoidConditionalStatements -- temporary Project Studio rollout
-    end
-
-    context 'if user is signed in as developer' do
-      let(:issuable_container) { '[data-testid="issuable-container"]' }
-
-      before_all do
-        project.add_developer(user)
-      end
-
-      context 'when accessing work item from project work item list' do
-        before do
-          sign_in(user)
+  context 'if user is signed in as developer' do
+    let(:issuable_container) { '[data-testid="issuable-container"]' }
 
-          visit project_work_items_path(project)
-
-          first_card.click
-
-          wait_for_requests
-        end
+    before_all do
+      project.add_developer(user)
+    end
 
-        it_behaves_like 'work item drawer on the list page'
+    context 'when accessing work item from project work item list' do
+      before do
+        sign_in(user)
 
-        it 'updates start and due date on the list', :aggregate_failures do
-          within_testid('work-item-drawer') do
-            within_testid 'work-item-due-dates' do
-              click_button 'Edit'
-              fill_in 'Start', with: '2025-01-01'
-              fill_in 'Due', with: '2025-12-31'
-            end
+        visit project_work_items_path(project)
 
-            close_drawer
-          end
+        first_card.click
 
-          expect(first_card).to have_content('Jan 1 – Dec 31, 2025')
-        end
+        wait_for_requests
       end
 
-      context 'when accessing work item from project issue list' do
-        before do
-          stub_feature_flags(work_item_planning_view: false)
-
-          sign_in(user)
-
-          visit project_issues_path(project)
+      it_behaves_like 'work item drawer on the list page'
 
-          first_card.click
-
-          wait_for_requests
-        end
-
-        it_behaves_like 'work item drawer on the list page'
-
-        it 'updates start and due date on the list', :aggregate_failures do
-          within_testid('work-item-drawer') do
-            within_testid 'work-item-due-dates' do
-              click_button 'Edit'
-              fill_in 'Start', with: '2025-01-01'
-              fill_in 'Due', with: '2025-12-31'
-            end
-
-            close_drawer
+      it 'updates start and due date on the list', :aggregate_failures do
+        within_testid('work-item-drawer') do
+          within_testid 'work-item-due-dates' do
+            click_button 'Edit'
+            fill_in 'Start', with: '2025-01-01'
+            fill_in 'Due', with: '2025-12-31'
           end
 
-          expect(first_card).to have_content('Jan 1 – Dec 31, 2025')
+          close_drawer
         end
-      end
-    end
-  end
-
-  context 'when project studio is disabled' do
-    context 'if user is signed in as developer' do
-      let(:issuable_container) { '[data-testid="issuable-container"]' }
 
-      before_all do
-        project.add_developer(user)
+        expect(first_card).to have_content('Jan 1 – Dec 31, 2025')
       end
+    end
 
-      context 'when accessing work item from project work item list' do
-        before do
-          sign_in(user)
-
-          visit project_work_items_path(project)
-
-          first_card.click
-
-          wait_for_requests
-        end
+    context 'when accessing work item from project issue list' do
+      before do
+        stub_feature_flags(work_item_planning_view: false)
 
-        it_behaves_like 'work item drawer on the list page'
+        sign_in(user)
 
-        it 'updates start and due date on the list', :aggregate_failures do
-          within_testid('work-item-drawer') do
-            within_testid 'work-item-due-dates' do
-              click_button 'Edit'
-              fill_in 'Start', with: '2025-01-01'
-              fill_in 'Due', with: '2025-12-31'
-            end
+        visit project_issues_path(project)
 
-            close_drawer
-          end
+        first_card.click
 
-          expect(first_card).to have_content('Jan 1 – Dec 31, 2025')
-        end
+        wait_for_requests
       end
 
-      context 'when accessing work item from project issue list' do
-        before do
-          stub_feature_flags(work_item_planning_view: false)
-
-          sign_in(user)
-
-          visit project_issues_path(project)
+      it_behaves_like 'work item drawer on the list page'
 
-          first_card.click
-
-          wait_for_requests
-        end
-
-        it_behaves_like 'work item drawer on the list page'
-
-        it 'updates start and due date on the list', :aggregate_failures do
-          within_testid('work-item-drawer') do
-            within_testid 'work-item-due-dates' do
-              click_button 'Edit'
-              fill_in 'Start', with: '2025-01-01'
-              fill_in 'Due', with: '2025-12-31'
-            end
-
-            close_drawer
+      it 'updates start and due date on the list', :aggregate_failures do
+        within_testid('work-item-drawer') do
+          within_testid 'work-item-due-dates' do
+            click_button 'Edit'
+            fill_in 'Start', with: '2025-01-01'
+            fill_in 'Due', with: '2025-12-31'
           end
 
-          expect(first_card).to have_content('Jan 1 – Dec 31, 2025')
+          close_drawer
         end
+
+        expect(first_card).to have_content('Jan 1 – Dec 31, 2025')
       end
     end
   end
diff --git a/spec/helpers/application_helper_spec.rb b/spec/helpers/application_helper_spec.rb
index ecd431ca322ffcc4352378b82f4d9a7abd4bd4cf..4723714d5ace1c4ad96b85233268ce824b6d29d4 100644
--- a/spec/helpers/application_helper_spec.rb
+++ b/spec/helpers/application_helper_spec.rb
@@ -512,22 +512,6 @@ def expect_autocomplete_data_sources_to_contain(object, noteable_type, source_ke
     end
   end
 
-  describe '#project_studio_enabled?' do
-    let(:user) { build(:user) }
-
-    before do
-      allow(helper).to receive_messages(current_user: user, cookies: { studio: 'true' })
-    end
-
-    it 'calls ProjectStudio#enabled?' do
-      expect_next_instance_of(Users::ProjectStudio, user) do |studio|
-        expect(studio).to receive(:enabled?)
-      end
-
-      helper.project_studio_enabled?
-    end
-  end
-
   describe '#body_data' do
     context 'when @project is not set' do
       it 'does not include project data in the body data elements' do
diff --git a/spec/models/users/project_studio_spec.rb b/spec/models/users/project_studio_spec.rb
deleted file mode 100644
index 6f041e24673faff004e4a4817a180697fa78a23f..0000000000000000000000000000000000000000
--- a/spec/models/users/project_studio_spec.rb
+++ /dev/null
@@ -1,102 +0,0 @@
-# frozen_string_literal: true
-
-require 'spec_helper'
-
-RSpec.describe Users::ProjectStudio, feature_category: :user_profile do
-  using RSpec::Parameterized::TableSyntax
-
-  let_it_be(:user) { create(:user) }
-
-  describe "sanity check that project studio is default enabled" do
-    before do
-      # -- temporary Project Studio rollout
-      skip 'Test not applicable in classic UI' if ENV["GLCI_OVERRIDE_PROJECT_STUDIO_ENABLED"] == "false"
-    end
-
-    it "passes", quarantine: 'https://gitlab.com/gitlab-org/quality/test-failure-issues/-/issues/17820' do
-      expect(described_class.new(user).enabled?).to be(true)
-      expect(described_class.enabled_for_user?(user)).to be(true)
-    end
-  end
-
-  describe '#enabled?' do
-    context 'when user is nil' do
-      context 'when the Project Studio is not available' do
-        before do
-          stub_feature_flags(paneled_view: false)
-        end
-
-        it 'returns `false`' do
-          expect(described_class.new(nil).enabled?).to be false
-        end
-      end
-
-      context 'when the Project Studio is available' do
-        before do
-          stub_feature_flags(paneled_view: true)
-        end
-
-        it 'returns `true`' do
-          expect(described_class.new(nil).enabled?).to be true
-        end
-      end
-    end
-
-    context 'when user is present' do
-      let(:project_studio) { described_class.new(user) }
-
-      context 'when the Project Studio is not available' do
-        before do
-          stub_feature_flags(paneled_view: false)
-          stub_env('GLCI_OVERRIDE_PROJECT_STUDIO_ENABLED', 'false')
-        end
-
-        it 'returns `false`' do
-          expect(project_studio.enabled?).to be false
-        end
-      end
-
-      context 'when the Project Studio is available' do
-        before do
-          stub_feature_flags(paneled_view: true)
-        end
-
-        it 'returns true' do
-          expect(project_studio.enabled?).to be true
-        end
-      end
-    end
-  end
-
-  describe '#enabled? with GLCI_OVERRIDE_PROJECT_STUDIO_ENABLED set to false' do
-    before do
-      stub_env('GLCI_OVERRIDE_PROJECT_STUDIO_ENABLED', 'false')
-    end
-
-    context 'when user is nil' do
-      it 'returns false' do
-        expect(described_class.new(nil).enabled?).to be false
-      end
-    end
-
-    context 'when user is present' do
-      where(
-        :paneled_view_flag,
-        :expected_result
-      ) do
-        false | false
-        true  | false
-      end
-
-      with_them do
-        before do
-          stub_feature_flags(paneled_view: paneled_view_flag)
-        end
-
-        it 'returns expected result' do
-          expect(described_class.new(user).enabled?).to be expected_result
-        end
-      end
-    end
-  end
-end
diff --git a/spec/policies/global_policy_spec.rb b/spec/policies/global_policy_spec.rb
index 22793569a98a4082142d01f9ac69d7d91626bddb..f4ce191e0e7b29f2fc2553def4c3be4c81c6ad0f 100644
--- a/spec/policies/global_policy_spec.rb
+++ b/spec/policies/global_policy_spec.rb
@@ -659,25 +659,7 @@
   end
 
   describe 'enable_project_studio' do
-    context 'when ProjectStudio is available' do
-      before do
-        allow_next_instance_of(Users::ProjectStudio) do |instance|
-          allow(instance).to receive(:enabled?).and_return(true)
-        end
-      end
-
-      it { is_expected.to be_allowed(:enable_project_studio) }
-    end
-
-    context 'when ProjectStudio is not available' do
-      before do
-        allow_next_instance_of(Users::ProjectStudio) do |instance|
-          allow(instance).to receive(:enabled?).and_return(false)
-        end
-      end
-
-      it { is_expected.to be_disallowed(:enable_project_studio) }
-    end
+    it { is_expected.to be_allowed(:enable_project_studio) }
   end
 
   describe 'log in' do
diff --git a/spec/support/shared_examples/features/comments_on_merge_request_files_shared_examples.rb b/spec/support/shared_examples/features/comments_on_merge_request_files_shared_examples.rb
index 2af7b1fea90a44886168b9408f438fd1787c8699..4e7f6bc0329745eb261431b7a7cb52e0eadb6bfb 100644
--- a/spec/support/shared_examples/features/comments_on_merge_request_files_shared_examples.rb
+++ b/spec/support/shared_examples/features/comments_on_merge_request_files_shared_examples.rb
@@ -2,11 +2,7 @@
 
 RSpec.shared_examples 'comment on merge request file' do
   it 'adds a comment' do
-    if Users::ProjectStudio.enabled_for_user?(user)
-      click_diff_line(find_in_panel_by_scrolling("[id='#{sample_commit.line_code}']"))
-    else
-      click_diff_line(find_by_scrolling("[id='#{sample_commit.line_code}']"))
-    end
+    click_diff_line(find_in_panel_by_scrolling("[id='#{sample_commit.line_code}']"))
 
     page.within('.js-discussion-note-form') do
       fill_in(:note_note, with: 'Line is wrong')
diff --git a/spec/views/layouts/application.html.haml_spec.rb b/spec/views/layouts/application.html.haml_spec.rb
index 72fb38b77c14aec47e84bf4610f71a029477a6c3..5077e018f9e6aa94819bafdc4d7db129838e1fba 100644
--- a/spec/views/layouts/application.html.haml_spec.rb
+++ b/spec/views/layouts/application.html.haml_spec.rb
@@ -46,11 +46,9 @@
       end
     end
 
-    context 'when user has `project studio` feature enabled' do
-      it 'renders the new global topbar' do
-        render
-        expect(rendered).to include('super-topbar')
-      end
+    it 'renders the new global topbar' do
+      render
+      expect(rendered).to include('super-topbar')
     end
   end
 
diff --git a/spec/views/profiles/preferences/show.html.haml_spec.rb b/spec/views/profiles/preferences/show.html.haml_spec.rb
index 8fbe203b3295de3040c7cbbcf94314655f967afb..6ba5984946ee2a10bb179ca8f32d5e3f2f8cfd65 100644
--- a/spec/views/profiles/preferences/show.html.haml_spec.rb
+++ b/spec/views/profiles/preferences/show.html.haml_spec.rb
@@ -22,17 +22,6 @@
     end
   end
 
-  context 'navigation theme' do
-    before do
-      skip 'Test not applicable in new UI' if Users::ProjectStudio.enabled_for_user?(user)
-      render
-    end
-
-    it 'has an id for anchoring' do
-      expect(rendered).to have_css('#navigation-theme')
-    end
-  end
-
   context 'syntax highlighting theme' do
     before do
       render