ISTWCMS-5711: forcing the submenu with class sub-1 to have inline-grid when children present

src/patterns/04-components/menu/menu--horizontal/_menu--horizontal.scss

@@ -588,7 +588,7 @@ $menu-horizontal-drop-bg: #f7f7f7;
           /* for Chrome and Edge Brave Opera */
           break-inside: avoid;
           /* for Firefox */
-          display: inline-grid;
+          display: inline-grid !important;
           page-break-inside: avoid;
         }
       }