diff --git a/core/modules/toolbar/js/models/ToolbarModel.js b/core/modules/toolbar/js/models/ToolbarModel.js
index 537601d..b746fda 100644
--- a/core/modules/toolbar/js/models/ToolbarModel.js
+++ b/core/modules/toolbar/js/models/ToolbarModel.js
@@ -64,7 +64,7 @@
        *
        * @type {bool}
        */
-      isFixed: false,
+      isFixed: true,
 
       /**
        * Menu subtrees are loaded through an AJAX request only when the Toolbar
@@ -81,7 +81,7 @@
        *
        * @type {bool}
        */
-      isViewportOverflowConstrained: false,
+      isViewportOverflowConstrained: true,
 
       /**
        * The orientation of the active tray.