Audio problem + home screen

I’m guessing you have some sort of AV receiver so you may want to insure you have the audio prefs set to the way Firecore recommends them here. Audio Options (tvOS) – Firecore

As to the loss of the new set up and having to add shares back again that was a problem caused by Apple iCloud as discussed here. Lost all Favorites, Up-Next, etc

To get the favorites and lists back here is a post that will guide you a bit. Lost whole library