How to open a 'magnifying glass' on macbook pro. OSX 10.12.6

Please bear with me on this one... I was just looking at a document in either Safari or Preview, (I believe Safari), and accidentally opened a 'magnifying glass' by a couple of accidental button presses.

One button was the command and the other was from the upper left part of the keyboard. I may have been trying to switch between documents by using command+~.

Anyway, when the magnifying glass opened, I got caught up in trying to make it go away. And, by that time couldn't figure out how to recreate it. And, I had even forgotten what I was trying to do in the first place, (I had a bunch of windows open and I believe I was trying to 'clean up')