https://wccftech.com/youtube-brings-a-new-interface-on-android-tv-and-fire-tv/

The good thing about YouTube is that it basically has the same app across the number of TV platforms that it supports, and over the past couple of weeks, YouTub is rolling out a revamped interface to some platforms, and today, we have got a look for you how it looks on Android TV, Fire TV, and hopefully, more platforms in the future.

Over the past couple of weeks or so, there has been a server-side change to the YouTube apps that are available on both Android TV and Fire TV. At the moment the look of the video player UI has been switched, and the change is emphasizing the video at all the times even when you have the seek par on the screen.