Limited Support
Our team is currently on holiday, so support will be limited during this period. Response times may be slower than usual, and some inquiries may be delayed.
We appreciate your patience and understanding, and we’ll resume our usual support by the end of August.
I mean other CSS codes for whole website, not for forum. This is a menu css issue and the menu is not forum specific object, it may affected from all plugins and theme. Please change the theme and delete all caches then test it. Also do the same with disabling other plugins. Don't forget test it using browsers private session in mobile devices.
Also please make sure the "Show Top/Menu Bar" is enabled in Dashboard > Forums > Settings > Features admin page.
I have not changed anything about the css of WP.
Would not know where to find this.
I have done everything you have recommended.
Hopefully it is going well now.
You meant this?