I agree with mbovenka
A normal install never replaces a library with an empty one.
A Normal Uninstall leaves behind anything that belongs to the user (as opposed: to the system). This includes: The configuration folder (and sub folders) , ALL Libraries, Auto-add folder.
Note: These are PER (logon) USER. The Library might be in a 'public' space, but settings,PI's are per user (And bad things can happen if you use the OS switch-users with calibre open for each user on the same Library)
If your OS search did not find any trace of metadata.db, your search is bad: because it should have found the 'Empty Library' that you see. Additional LOCATIONS are THE other (possible) libraries
Libraries don't automagicaly appear on the Quick Switch list. You must use calibre to visit them for them to appear (there is also a limit on how many the list remembers). Just because they don't show, does not indicate that they don't exist.
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