Hi
One of the freedoms Koreader provides is that it allows you to use the font of your choice. On my PW3, I can use the fonts provided by Amazon for the Kindle, the ones provided by Koreader and others that I added myself.
The problem is that it's a bit too much.

Though I ordinarily use less than half a dozen, my screen is cluttered by four pages of fonts. See a screenshot for one of these pages. For example I don't even remember using once Helvetica Neue or Futura (though I like Bookerly).
We have no control at all regarding Kindle fonts. Regarding them, is there a way to clean their display? (select some, put away others).
Also, if I suppress some of the Koreader fonts, will I get them back at the next OTA update?