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To use apps in Split View on other displays, make sure the Displays have separate Spaces checkbox is selected in Mission Control preferences. You can use the following steps to split your screen with multiple applications on a MacBook running macOS Catalina or later: Open program windows: You can open two or more windows that you want to use in a split screen on your monitor. You can also drag an app thumbnail onto another in the Spaces bar. In the right half of your screen, the other windows you have open appear. Stop clicking and your window will move to the left half of your screen or monitor. Press Control-Up Arrow (or swipe up with three or four fingers) to enter Mission Control, drag a window from Mission Control onto the thumbnail of the full-screen app in the Spaces bar, then click the Split View thumbnail. You are ready to enter split screen mode.
If you are using an app full screen, you can quickly choose another app to work with under Split View mode. To go back to the full screen or stop using an app in Split View mode, click its window, show the menu bar, move the pointer to the green button in the top-left corner of the window, then click to exit or use the Exit Full Screen from the menu that appears.