iPad (6th Generation)
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Turning Offload Unused Apps on or off
You can set your tablet to automatically remove apps you haven't used for a long time to free up tablet memory. All app settings and data are saved and will be restored when you reinstall the app from App Store.
Press Settings.
Press iTunes & App Store.
Press the indicator next to "Offload Unused Apps" to turn the function on or off.
Press the Home key to return to the home screen.