This question already has an answer here:
The Notes app on El Capitan now has a number of styles, such as Body and Heading. How do I change the fonts associated with this?
I tried to make changes to the
DefaultFonts.plist file, but it appears that the new System Integrity Protection has locked that down. Notes, of course, doesn’t have a preferences setting.
I really don’t like the font that’s showing up, and I don’t want to have to individually change all of my notes.
Note: This is not a duplicate of How to change the default font and size in Notes on El Capitan?. (a) I am referring to the release version; (b) I want to change the font styles; (c) It hasn’t been answered anyway.