Plex uses a small orange triangle is displayed in the top right corner of the poster for unwatched items when viewing a Library, would like to have a bookmark flag also displayed, perhaps on the top left corner to identify items marked on watchlist when viewing a library and more importantly when browsing content in the discover mode.
I can’t keep mental track of all the items that myself and others have marked in the watchlist, so when browsing content in the discover mode I have to open to verify it has been marked.
Adding a flag overlay to the poster would make browsing discover mode and tagging shows to add the the watchlist much easier and more effective
It seems your suggestion is somewhat included in this existing feature suggestion post. Though your suggestion seems to be a bit more focused (aiming at some visual indicator for items in your watchlist while the other thread asks for better visualization of a multitude of status).
If you consider your suggestion is covered in that thread, you could comment/vote there.
Otherwise we could keep yours to focus primarily on visualizing the watchlist status in library views.
