Samsung SM-T525 User Manual page 27

Basics
Launching applications in a split screen Multi Window
1
Drag your finger from the right edge of the screen towards the middle of the screen.
Alternatively, tap and hold
The Multi Window tray appears at the right side of the screen.
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.
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27
Multi Window tray