To zoom out, you perform the same actions with your mouse as you would when you are scrolling up and down a page. For instance, on a Mac, you would have your two fingers on the trackpad and then push them apart (as documented in method 1 of https://www.wikihow.tech/Zoom-in-on-a-Mac).
thank you. I was working without a mouse yesterday, and I'm not a fan of the track-pad so I never tried that. Now that I have a mouse attached it works great.