Quote:
Originally Posted by DNSB
In the calibre search bar, type 'formats:false' without the quotes. This will return a list of all books without a valid book format in the database when you click on Search. If you see Filter between Search and Saved Searches, click on it to change to Highlight so only the selected books will be shown. Then select all the books shown and delete them.
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That button will only be seen in the Search bar if the "Show a quick toggle button to switch between highlighting and restricting results next to the Search bar" is checked in Preferences->Searching… the default is unchecked.
BR