To avoid having to use Sigil, with the most recent versions of Calibre (I'm using 0.9.23) you can do this:
- Right-click the book in the Library, choose "Tweak book", then Explode book. This will generate an unzipped version of your EPUB on a temporary directory.
- in the explorer window that opened, delete the files titlepage.xhtml and cover.jpeg
- back in Calibre, choose Rebuild book.
Voilá, no cover in ebook!
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