When
you install new apps to your Android, the system stacks up the icons
automatically without asking you to select a home screen. But you can
subsequently re-arrange the icons on the home screens and on the tray.
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Touch and hold any icon on your screen for a second.
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Drag the icon to a different spot on the screen, or even to or from the tray, except for the permanent "All Apps" icon.
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You can also drag an icon to the left or right edge of the screen
until it starts sliding, then drop the icon to another screen.