Back up your library first in case things go pear shaped.
Then open calibre library you want to change.
Select all the books then right click on remove books in the icon at the top and you will find an option to remove all file types except…
Click on that and the files types you want to remove will be no more. The deleted files will be kept hidden for a few days and then completely removed.
Last edited by Martinoptic; 10-19-2024 at 01:46 PM.
Reason: Clarification
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