PMS Version: 1.13.6.5339
Web Version: 3.63.1
PMP Version: 2.17.0
This issue started with the version of PMS @aktersnurra95 is running, v1.13.5.5291.
The bug was brought up before here in the forums ([BUG] Seasons options for TV Series libraries seem broken) by @NextFire, and acknowledged by a mod (@OttoKerner). I was honestly hoping it would have been addressed in this latest release (v1.13.6.5339), but no such luck.
I really hope this gets fixed soon, as the majority of my media collection is single-season shows, and it makes for an unpleasant UX to have to needlessly click through another UI layer on every show.
As a note, Episode Sorting has the same “Library default” option, which, as mentioned by the OP, makes no sense in the context of a Library option - these options exist to set the defaults for the library, and without setting them, the “Library default” it refers to does not exist.
Does anyone know where the files containing the library settings are stored, and if it is possible to manually edit them to restore the “Hide seasons for single season shows” functionality, at least until the issue is properly fixed?