Tested on a fresh joomla install in firefox desktop(mobile view) + firefox and chrome on android.
-on mobile : set menu items to 1(see screenshot) and the menu will automatically open if you are loading the page on mobile.(other screenshot)
-on desktop and mobile : "more" shows in the dropdown menu which does not make sens because it is already shown on top
-on mobile menu : "home" menu shows up twice
-on mobile : no scrollbar + no close button.
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