I think it’s bad enough that you can’t properly change the default font (not just the size) in the Notes App.
I have got used to selecting all and changing the font manually. However, if I press Return at the end of a line, and wait more than a second, the font reverts to the default, rather than the font of the previous line. If I’m quick enough, the font is the same as the previous line.
How can I get the notes app to stick to the chosen font?