Hey, give this a shot.
From a Home screen, tap the Recent apps icon Recent apps icon (bottom-left).
Scroll left or right to locate the preferred app then tap the app icon (e.g., calendar, gallery, email) located at the top of the panel.
Tap Open in split screen view.
From the Recent apps screen tap the second application to be viewed.
Note When on, tap the Recent apps icon (lower-left) to change the current app.
Note Adjust the size of the apps by sliding the horizontal bar between the apps up or down.
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