Samsung SM-P900 User Manual page 26

Basics
2
Tap and hold an application icon on the Multi Window tray, and then drag it to the screen.
Release the application icon when the screen turns blue.
3
Tap and hold another application icon on the Multi Window tray, and then drag it to a
new location.
You can launch the same application in a split screen at the same time. Only
applications with next to its icon support this feature.
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