Ever since I have switched to using spaces on my Mac, I have had a maddening intermittent problem that I couldn’t figure out a solution to. Occasionally when I switched spaces using control-arrow on the keyboard, my screen would zoom in and I couldn’t figure out why.
Turns out, I apparently sometimes move to fast on the keyboard while at the same time, not moving fast enough! That sounds confusing, but let me explain. I would switch a space with control-arrow, lift up on the arrow key, but manage to sometimes to keep the control key press long enough for me to use my mouse’s scrollwheel.
For the longest time, I couldn’t connect all of these dots, but I finally found the preference to turn off the control-scroll zoom feature. Open up your Mac’s System Preferences and click on Mouse. You will see an option for the zoom on scroll feature at the bottom of the window. Just uncheck it and you are all set!