Just as MtG and Ann Bens mention above, you can poke the eye button on the timeline n the graphic layer to turn the overlay on or off. Here is the link if you would like to download it for free: Rule of Thirds Premiere Pro CC Overlay — Premiere Gal Hope that helps. Votes ...
Use the rule of thirds in photography to create wonderful compositions. Learn how to apply the rule of thirds when shooting and editing photos with Adobe.