For learning how to do split screen on Mac, you must know that the Split View feature is present in macOS by default. The first step is to have both apps ready. The next thing is to hover your cursor over the green button for full screen at the top-left of the first window and click either "Tile Window to Left of Screen" or "Tile Window to Right of Screen. " You then pick the second app from the open windows you have. Both apps will be displayed next to each other so that you can multitask, compare files, write notes, or browse content more efficiently.