I know this has been asked so many times (found a post back from 2017) but here we are 8 years after and nothing like that was implemented yet 
It would be essential having filters when browsing a library added to the top. It’s time saving having the ability to filter a library by watched/unwatched or even by genre. I am not talking about creating lists… just a filter of whatever is being displayed to the screen. This feature alone would be a decision maker to many people.