Samsung Galaxy C9 Pro Manual page 44

Basics
Split screen view
1
Tap to open the list of recently used apps.
2
Swipe upwards or downwards and tap
The selected app will launch in the upper window.
3
Swipe to the left or right to select another app to launch.
You can also launch the split screen view by tapping and holding
Using additional options
When using apps in the split screen view, select an app window and tap the circle between
the app windows to access the following options:
on a recent app window.
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