Yes, I use the extra menu as vertical menu in the right sidebar for pages with subpages (http://wp2.strafverteidiger-cuxhaven.de/rechtsanwaelte/). This sidebar is hidden on mobile devices, where I need the submenus of the main menu.
I asked about a smarter way to get rid of the dropdown submenus on not-mobile-devices. There could be a way to use a main menu without submenus on not-mobile-devices and a main menu with submenus on mobile devices. Seems there isn’t.
Thank you