[faniediv]

My Calibre library is very big. The problem is that I have thousands of duplicate files in the library. It does not show as duplicate books, they are just there in the directory. In other words calibre only recognise one book although there are more than one file. How do I get rid of them? In one post it was suggested that the calibre library is exported, and calibre will then only export the files it uses.
I cannot find this function anywhere in the newer versions of calibre. How do I do this?
I have used “check library” under “Library Maintenance” without success.
None of the options under Quality Check seems to be applicable.
Advise will be appreciated