While you can't change the fonts, you can choose a different theme!

We do some tricky maths when creating a PDF, which makes it hard to change font sizes. We’ve picked a “good” size for print, and users writing a “normal” book (e.g. not for kids) should find it to be comparable to industry standards.

You can change the theme by clicking on "Settings" (cog icon) at the bottom-right of the book editor’s screen.
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