diff -u b/core/profiles/demo_umami/themes/umami/css/components/navigation/menu-main/menu-main.css b/core/profiles/demo_umami/themes/umami/css/components/navigation/menu-main/menu-main.css
--- b/core/profiles/demo_umami/themes/umami/css/components/navigation/menu-main/menu-main.css
+++ b/core/profiles/demo_umami/themes/umami/css/components/navigation/menu-main/menu-main.css
@@ -23,7 +23,6 @@
    * See: https://css-tricks.com/using-css-transitions-auto-dimensions/
    */
   max-height: 0;
-  overflow-y: auto;
 }
 .menu-main--collapsed li {
   visibility: hidden;