In macOS, the Hot Corners feature turns each of the four corners of your screen into a designated action, allowing you to quickly access certain functions built into the system, such as Mission Control, Notification Center, the Screen Saver, QuickNote, and more. Many Mac users would agree, there’s something satisfying about bringing up these commonly used functions with a simple, swift cursor movement.
What isn’t so satisfying, however, is accidentally triggering a Hot Corner, which can lead to all kinds of unintended desktop behavior – like application windows flying all over the place. This can happen when you lose track of the mouse cursor, or when you’re working within the confines of a smaller MacBook screen. Thankfully, there’s a way to tame wayward Hot Corners using modifier keys. Here’s how.
Read more at MacRumors.com