Split screen, a feature that got introduced in Nougat, lets you share the screen with two apps.
Let's see how to use this multitasking feature on Android Pie.
Go to the “Overview” screen by pressing the “Recents” button.
Find the app you want (if it is not there, then open the one you prefer, and then you can find it here).
Long press that app icon and you can see “Split screen.” hit it.
Now, the app you chose is at the top of the screen.
At the bottom of the screen, you can see any one of the following:
That's it. All done.
It is important to note that some apps don’t support split screen.
Also, note that you can use the “Quick Switch” feature to replace the app at the bottom. Moreover, you can replace the app at the bottom with any app at any time you want. However, you can’t change the app at the top without exiting the split screen.
Keep in mind that split screen feature works in "Landscape" mode too.
Exit Split Screen
If you want to exit the split screen, follow this step - Drag the divider towards top or bottom (right or left if you're in Landscape mode) and that’s it.
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How to Use Split Screen on Android Pie