Samsung SM-A600GN, User Manual, Page: 113 / 212

Apps and features
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On the lower window, swipe left or right to select another app to launch.
To launch apps not on the list of recently used apps, tap the Home button or Back button
and select an app.
Adjusting the window size
Drag the bar between the app windows up or down to adjust the size of the windows.
When you drag the bar between the app windows to the top or bottom edge of the screen,
the window will be maximized.