In the home page of my server (the page which comes after selecting my server from the side bar),
it shows the same movies twice in the recently added and continue watching section. this is because i have a main movie library, and then separate libraries for some categories.
in my files i have a movie folder, inside which i have all my movies, but for those categories i have more folders in the movie folder, labelled with the category names. this way i can point the category libraries to each of their folders, and the movie library to the movie folder.
So all movies, including the movies from the categories show when i go to the movie library, and the category libraries only show their movies.
There’s already an existing suggestion asking for Plex not to show multiple instances of the same movie/episode in Continue Watching if they’re available in multiple libraries. Please comment/vote in that thread in order to help us avoid distracting or cannibalizing votes.
Unless I’m missing some unique aspect of your suggestion I’ll close this thread as a duplicate.
An alternative might be to consolidate your different libraries (e.g. using the Categories tab to display a filtered version of the library.