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@Melba12
Users should not EVER copy book contents of one Library to another using the OS. (we call this 'messing under the skirts') Calibre (app) must make all changes to keep the DB in sync with the files stored. Very bad things can happen when this goes sideways.
The one exception: If you copy the ENTIRE contents of the OLD Library folder, to a NEW EMPTY folder .
To Move / Copy specific contents (selected books), use the builtin Copy to Library menu item. That even brings the Library version of the Metadata across.
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