Oh, screen zoom. You’re great for getting a close look at pictures and text, but if accidentally activated by an unaware user, you can be a nightmare – and that goes for both Mac and PC users. Macheads can undo the damage by holding down the Control button, then using fingers to swipe from the top of the trackpad to the bottom. To rezoom, simply swipe upward. If you’re worried about getting stuck in zoomed-in purgatory, you can disable this feature – go to System Preferences, click Trackpad, and then uncheck the Screen Zoom box.

Windows calls the feature Magnifier, and it can be found in the Ease of Access settings in the Control Panel. If you’ve turned it on by mistake, look for a magnifying- glass icon in the upper left corner of the screen. Click it and follow the dialogue box’s instructions to exit the mode. Then go to the Ease of Access settings and deselect Turn On Magnifier.