The Accidental Overview
Mission Control is a fantastic macOS feature that zooms out to show all your open windows at once. Apple provides several ways to trigger this, including a feature called “Hot Corners.” By default, or through accidental configuration, a specific corner of your screen (often the top-right) might be assigned to activate Mission Control. This means every time you lazily throw your mouse cursor into that corner—perhaps aiming for a close button or just resting your hand—the entire screen suddenly swoops back into the Mission Control view. This jarring, unintended animation completely breaks your focus and forces you to hunt for the window you were just working on.
Disarming the Hot Corners
To prevent these accidental triggers and stop macOS from automatically activating Mission Control when your mouse hits the edge of the screen, you must disable the assigned Hot Corners.
Click the Apple logo in the top-left corner of your screen and select System Settings. In the left-hand navigation sidebar, click on Desktop & Dock. Scroll all the way down to the very bottom of the right-hand panel until you see a button labelled Hot Corners…. Click this button. A small diagram of your monitor will appear, with a dropdown menu in each of the four corners. Look closely at all four menus. If any of them are currently set to Mission Control, click that specific dropdown menu and change the selection to the dash symbol (-). This dash indicates that the corner is completely deactivated. Once you have cleared the unwanted triggers, click the Done button. You can now move your mouse freely without fear of the screen zooming out.