diff --git a/app/assets/stylesheets/framework/ds_experiments.scss b/app/assets/stylesheets/framework/ds_experiments.scss
index 2ef632a18c94e0f9dbdfd2edfd80a067704948e1..ff6c30dea5340968bc138e690f1903bd62f72dbe 100644
--- a/app/assets/stylesheets/framework/ds_experiments.scss
+++ b/app/assets/stylesheets/framework/ds_experiments.scss
@@ -173,6 +173,17 @@
     @apply gl-rounded-b-lg;
   }
 
+  // Make merge request header full-width on changes tab
+  .container-fluid:not(.container-limited),
+  .container-fluid.rd-page-container {
+    .detail-page-header,
+    .detail-page-description,
+    .merge-request-tabs-container {
+      &.is-merge-request {
+        max-width: none !important;
+      }
+    }
+  }
 }
 
 // GlBadge within GlButton variants