Ticket #36884: 36884.diff

src/wp-admin/css/nav-menus.css

@@ -776 +776 @@
 }
 
 @media screen and ( max-width: 782px ) {
-        body.nav-menus-php {
+        body.nav-menus-php,
+        body.wp-customizer {
                 min-width: 0 !important;
         }