Samsung SM-A530F Manual page 110

Apps and features
Using additional options
Tap the bar between the app windows to access additional options.
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.
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Use the snap window
feature.
Close the app.
Switch the selected
window to a pop-up
view.
Switch locations
between app windows.