Remove book covers in Moonreader+ ?

[coolioniki]

Hello!

I download fanfiction from ao3 to read offline, and sometimes there is art embedded in the fic. Although I appreciate the art, sometimes it appears as the cover in Moonreader.

I have tried to edit the metadata in Calibre (created a standard cover, and removed cover) but the standard cover doesn't appear in Moonreader, and removing the cover doesn't remove it either.

I'm not quite sure what I've done - usually I download as an azw3 or epub file and edit the tags just so I can sort my library easier, but I am unable to remove the covers due to the cache folder (as even if I delete the files, clicking to read the book will just bring it back).

tldr: Can't remove covers in moonreader, advice is much appreciated.

Thank you!