diff --git a/core/modules/toolbar/js/toolbar.es6.js b/core/modules/toolbar/js/toolbar.es6.js
index f715fc7fc9..f5793cf730 100644
--- a/core/modules/toolbar/js/toolbar.es6.js
+++ b/core/modules/toolbar/js/toolbar.es6.js
@@ -136,15 +136,6 @@
           .on('change:activeTray', (model, tray) => {
             $(document).trigger('drupalToolbarTrayChange', tray);
           });
-
-        // If the toolbar's orientation is horizontal and no active tab is
-        // defined then show the tray of the first toolbar tab by default (but
-        // not the first 'Home' toolbar tab).
-        if (Drupal.toolbar.models.toolbarModel.get('orientation') === 'horizontal' && Drupal.toolbar.models.toolbarModel.get('activeTab') === null) {
-          Drupal.toolbar.models.toolbarModel.set({
-            activeTab: $('.toolbar-bar .toolbar-tab:not(.home-toolbar-tab) a').get(0),
-          });
-        }
       });
     },
   };
diff --git a/core/modules/toolbar/js/toolbar.js b/core/modules/toolbar/js/toolbar.js
index 547bcd9bac..0b9de12962 100644
--- a/core/modules/toolbar/js/toolbar.js
+++ b/core/modules/toolbar/js/toolbar.js
@@ -93,12 +93,6 @@
         }).on('change:activeTray', function (model, tray) {
           $(document).trigger('drupalToolbarTrayChange', tray);
         });
-
-        if (Drupal.toolbar.models.toolbarModel.get('orientation') === 'horizontal' && Drupal.toolbar.models.toolbarModel.get('activeTab') === null) {
-          Drupal.toolbar.models.toolbarModel.set({
-            activeTab: $('.toolbar-bar .toolbar-tab:not(.home-toolbar-tab) a').get(0)
-          });
-        }
       });
     }
   };