Using Split Screen on a Mac is easier than ever before in the latest versions of MacOS, including macOS Monterey, Big Sur, and Catalina. You can nearly instantaneously split screen two different apps, or two windows from the same app. Perhaps you want two browser windows to be side-by-side, or a browser window split screened with a text editor, or your email split screen with a calendar. Whatever your needs for using Mac split screen mode, it’s simple to use once you learn how it works.