I’ve solved it, just add to the custom CSS.
html[data-neve-theme="dark"] .header-main {
--bgcolor: #121212;
}
change the .header-class to your own and pick your own color.
I solved the problem. I was using Cloudflare CDN and also activated Cloudflare Rocket Loader feature. Go to Cloudflare and turn off Rocket Loader and Purge Everything from its cache.
Here’s another person who had the same problem
https://theme.co/forum/t/mobile-page-dropdown-menu-not-working/53554/2
No, I’ve disabled all plugins and the problem still persists.