As you pinned the app by following these steps: 'Settings' > 'Security and privacy' > 'More security settings' > 'Pin app', and tap on the Recents button for 'Pin this app', you can follow the below steps to unpin screen on an Android device.
Step 1
Pin the app by tapping the Recents button.
Step 2
Press and hold the Recents and Back buttons at the same time.
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