Library stuff like columns is stored IN the DB for that library. Per Library
User stuff (anything that applies regardless of which Library is present) is stored in Appdata,
It does sound like something walked upon your Calibre settings folder.
If the plugins folder is intact (there will be plugin zip files and some other with the same basename (the PI settings)
Just replace only the FILE contents , not any of the folders in the config folder
BACK THAT UP FIRST
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