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Drag your first app over to the left:
Tap the other app that you wish to view in split screen and it should adjust size and appear
on the right hand side:
To exit multitask split screen, select the multi tasking icon and the right hand side app will
appear with a cross underneath. Touch the cross to close the app.
Simply drag the app that appears on the left hand side to open in full screen.
Please note: Some apps may not be supported.