FIXED WINDOWS WHILE ON CANVAS

hello team! I do A LOT of math on the canvas. Usually I take a screenshot of a problem from a problem set with the lasso and paste in my canvas. From there I start the exercise. It's really annoying when I'm in the middle of it and I need a detail from the exercise itself, as it may not enter everything in the screen at once and I need to come back up and read, go down and continue from where I left. I probably do that many times from just only one exercise. I would love a fixed window, similar to the magnifier: I pick a rectangle from the canva and a window with that will follow the screen everywhere. It would be cool if the window itself it's resizable and lockable. Nice app and thanks everyone!