Hello, @gwiezdnewrota,
Simply go to the Dashboard >> XStore >> Theme Options >> Theme Custom CSS and then paste the below code there and save settings.
div.mobile-menu-content .et_b_header-menu .menu li > .nav-sublist-dropdown:not(.nav-sublist){pointer-events:initial !important;}
Then check back to your site after clearing the browser cache.
Here is the video for a better reference to see that when you add the code your issue will be resolved: https://streamable.com/dn09ap
Regards 8Themes Team.