[SOLVED] Plex stuck on full screen outside my screen, PlexMediaPlayer folder missing

That’s because you are not using “Plex Media Player” anymore.
It’s just “Plex” in this case.
C:\Users\<username>\AppData\Local\Plex

Instead of deleting the whole plex.ini file, open it with notepad.exe, then remove just the section which is headed with [ui].

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