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I'm assuming you've tried going to the menu from within a book, tapping the "Aa" icon, and changing the font face from there?
If so, and it didn't work,
the font may be set in the stylesheet of the book. The Kobo devices don't override those, though I could be mistaken. To fix this, you can either delete the font setting in the stylesheet of the book, or delete the stylesheet altogether.
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