Originally Posted by aardbewoner
I wonder if there is a good way to delette the old formats in calibre,as i convert all books to epub.
Delette after check if conversion dit go ok
Must be a noob can`t find anything over this
Whether it's a good idea to remove source formats is up to you, but here is how you do it:
Search for: "formats:epub and formats:#>1" (without the quotes). This finds all books that have epubs *and* other formats. Select them and right-click. Remove books -> Remove all formats from selected books, except... -> select epub. Click 'OK'