you can use extension made by creator of piped Piped Redirects (it’s only on firefox)

privacy redirect isnt maintained anymore you can use libredirect instead it’s a fork of privacy redirect

Its also available on IzzyOnDroid repo

You can disable libretube proxy in settings

Did you install it from fdroid? There is a problem in fdroid version that crashes app when trying to play video. Its already fixed on github but fdroid is slow to update.