Restore missing scrollbar on boards

app/helpers/application_helper.rb

@@ -280,7 +280,7 @@ module ApplicationHelper
 
   def page_class
     class_names = []
-    class_names << 'issue-boards-page gl-overflow-hidden' if current_controller?(:boards)
+    class_names << 'issue-boards-page gl-overflow-auto' if current_controller?(:boards)
     class_names << 'environment-logs-page' if current_controller?(:logs)
     class_names << 'with-performance-bar' if performance_bar_enabled?
     class_names << system_message_class

changelogs/unreleased/psi-board-scroll.yml

+---
+title: Restore missing horizontal scrollbar on issue boards
+merge_request: 54634
+author:
+type: fixed