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Sorry, I misread. What is bad about the UX exactly? You don’t need to customize anything if you don’t want to; “it just works”. And I dont follow you on how having the option to customize things makes it a bad user experience. You’re assuming the native UI is bad for some reason.
I’ve used Plex a lot too back in the day but there’s nothing it provides that Jellyfin doesn’t do out of the box + self-hosted + for free.
If you just need a quick window open to make a note you might actually prefer Sticky Notes over Notepad!