Antonio Trifirò

Thanks Marcus, that’s the problem! Problem solved! Thanks a lot for your work! =)

theme-folder/plugins/events-manager/templates/events-list.php

I use a child-theme: maybe I have to put it in the main theme folder?

I resolved it, thanks. Just replaced the class .menu wiht the class .top-menu in the mobile design section of style.css. The same in the mobile menu section of the .js file.
Obviously I don’t need the main menu on mobile. =)

Ops, sorry! I put the code in a wrong place!
Thanks a lot!