[BetterRed]

Originally Posted by SandFish

Thanks for the fast response!
Generate Cover Customization works individually, but not in bulk.
SF

@Sandfish - in the customisation dialogue there's a check box at the bottom left labelled Save these settings as the defaults for future use

Providing that is checked and you click OK then the new default settings you saved will be applied in bulk edit - you might want to create a 'dummy' book (there's an option in Add Books) as a place to the customisation;

Added : if you want the Generate Cover Customisation dialogue to be available from within Bulk Metadata Edit, you could post a formal request here ==>> Bugs : calibre

BR