There is a sticky that points out you cannot change Calibre's file naming strategy inside the calibre library file storage.
This will not be an issue if you use the Calibre GUI to look at books. You are strongly discouraged from going directly to the Calibre files in its internal file storage as if you mess anything up there you adversely affect Calibe's ability to function correctly.
If you export books from Calibre then this limitation will not apply.
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