Thanks, good info! Not selecting the actual ruler placed on the canvas was what I was missing . Man, I sure wish I would have known about this earlier. I have Googled "how to make grids in MS5" at various times and never found anything. It might be worth it for this option to somehow be broadcasted more extensively. It's so useful, but maybe a little obscure in the workflow process.
CLIP STUDIO PAINT (formerly Manga Studio)