Maybe they're referring to the "Advanced" settings for a font? That's the only place I can recall the word "Advanced" being used in any settings menu.
If that's the case, you access it from within the book by touching the double A at the bottom of the book when you bring up the top and bottom menu bars by touching the center of the page. The Advanced setting for each font is to the right of the font name, but only the Kobo official fonts that came with the reader have that feature. If you're using a sideloaded font that you added, there is no Advanced setting for those.
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