diff --git a/frontend/src/stimulus/controllers/dynamic/work-packages/activities-tab/index.controller.ts b/frontend/src/stimulus/controllers/dynamic/work-packages/activities-tab/index.controller.ts
index cf2cc74fa9b..c3a7cd3a307 100644
--- a/frontend/src/stimulus/controllers/dynamic/work-packages/activities-tab/index.controller.ts
+++ b/frontend/src/stimulus/controllers/dynamic/work-packages/activities-tab/index.controller.ts
@@ -398,7 +398,7 @@ export default class IndexController extends Controller {
   }
 
   private getScrollableContainer():HTMLElement | null {
-    if (this.isWithinNotificationCenter()) {
+    if (this.isWithinNotificationCenter() || this.isWithinSplitScreen()) {
       // valid for both mobile and desktop
       return document.querySelector('.work-package-details-tab') as HTMLElement;
     }
@@ -419,6 +419,10 @@ export default class IndexController extends Controller {
     return window.location.pathname.includes(this.notificationCenterPathNameValue);
   }
 
+  private isWithinSplitScreen():boolean {
+    return window.location.pathname.includes('work_packages/details');
+  }
+
   private addEventListenersToCkEditorInstance() {
     this.onSubmitBound = () => { void this.onSubmit(); };
     this.adjustMarginBound = () => { void this.adjustJournalContainerMargin(); };