I want to change the color of the blinking cursor in the Scrivener 3 for Mac editor. Previous answers to this question have cited a “customizable color” menu. My version (3.2.2) does not have this. I can change the color of the cursor in composition mode but I want to change it in the Editor mode, too.
This setting is found in the Appearance: Textual Marks: Colors preference tab, with the same name used for Composition Mode, Insertion Point. That is always a good second place to check if you don’t find what you are looking for in Main Editor section.
I found it at about the same time as you posted this. Thanks. Wish I could have searched for change cursor color. “insertion point” is not the first thing I think of when I want to change the color of my cursor.
Insertion point, caret, cursor… no matter what we call it, someone will probably end up looking for something else. 
I’ve tended to avoid cursor in documentation and such, since that term has become common for describing the pointer, as moved around by a mouse or similar device, as well.