Navigation Dock
Go to Settings > System & updates > System navigation, and enable Navigation Dock.
After the Navigation dock button appears, you can:
• Drag the button to your desired position.
• Touch the button to go back.
• Double-touch the button to go back two steps.
• Touch and hold the button, then release it to go back to the home screen.
• Touch and hold the button, then swipe left or right to view recent tasks.
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