Completely Disable External Posters

[TheJellyMan]

I had a pretty large collection of movies before I started using Jellyfin. Many of them have poster jpegs in the same directory, with the same filename as the movie. The poster images usually don't look as "clean" as the ones from themoviedb, so my grid view looks kind of sloppy and unorganized. Is there a way to tell Jellyfin to never use external files for posters? I don't want to delete them.