Hello, @Alessandro,
Actually, The thing is when you use this code:
.nav-sublist-dropdown .container{height: 100% !important; overflow-y:scroll !important;}
the verticle menu works fine but not the other menu. To use the other menu works fine you have to use the below code too
#menu-main-1 .nav-sublist-dropdown .container{height: auto !important; overflow:initial !important;}
You can paste the above new code in the Dashboard >> XStore >> Theme Options >> Theme Custom CSS at the bottom of the CSS box.
Then the result will appear as you can see in the below image. https://postimg.cc/MvMmF21V https://postimg.cc/5XWLKH4W
Regards 8Themes Team.
