To enter split screen view, open "Recent Apps," long-press an app, and then tap "Split Screen."
Furthermore, not all apps support split screen mode — some apps, like games, require full-screen functionality.
How to use split screen mode on an Android deviceSince Android devices have different interfaces, depending on the manufacturer, you might notice that the steps for using split screen view are slightly different on your device.
If you view apps in split screen a lot, you'll notice that some apps are better equipped to split screen than others.
While in the "Recent Apps" screen, tap the icon of the app you want to use in split screen view.