In the tag editor, select Formats ==> PDF. (Or type
formats:"=PDF" into the search bar, but guess which one is easier.) Then Do Ctrl+A to select all currently displayed books (that is, the ones with a PDF version) and use Remove Books ==> Remove all files of a specific format ==> azw3.
If a book has an azw3 format, it will be deleted, but ONLY if it is also in the currently displayed search, of books that have a PDF format.
No need for custom columns, and this will make sure all your other azw3's are kept.
Quote:
Originally Posted by theducks
Select All Books (ctrl-A): Right click: Remove a specific format of all books: PDF
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The question is how to delete the NON-pdf version of all the pdfs.