I’ve reached out to YouTube and will update this article if I learn more, but, for now, all you can do is wait it out and hope that the tabs are restored on YouTube’s end. Hopefully, the removal of the Subscription and Library tabs is actually a bug and not an experiment by YouTube to further push the Home feed. YouTube has been trying to de-emphasize the subscription feed for years to push users towards the Home feed, where they have more control over what is listed. There’s no point in uninstalling the YouTube app, or worse, factory resetting your Fire TV to try to resolve the issue since it’s clearly something happening on YouTube’s side. YouTube apps essentially just being a web interface is why an issue like this one has affected so many different devices simultaneously. You used to be able to access the same web-based TV interface at /tv, but that access was shut down back in 2019. The YouTube app on virtually every TV platform is essentially just a web browser that loads a web interface for YouTube that is optimized for TVs. Some have had success in restoring the missing tabs by logging out or switching accounts, but there doesn’t seem to be a definitive fix for the issue. The same thing is happening on Rokus, LG and Samsung smart TVs, Xbox and Playstation gaming consoles, and other TV platforms, so the issue is widespread and not restricted to Fire TVs and Fire TV Sticks.

Many Fire TV owners are reporting that the “Subscription” and “Library” tabs in the navigation menu of the YouTube app have suddenly gone missing.

Youtube subscription feed