I've run into this problem myself. If you're using mixed kepubs and epubs, there's a kobopatch to make the font size consistent.
Otherwise, it's really up to the book CSS. One option is to edit the ebook and sideload it. What I do is use Kobo Utilities to set the font size ahead of time. It doesn't actually solve the issue, but it does prevent the fonts from carrying over between books.
Last edited by ownedbycats; 05-21-2022 at 04:24 AM.
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