How to use Galaxy S21 series navigation buttons?

Samsung offers navigation buttons and navigation gestures on Galaxy S21 series. So, you choose what you like to navigate through different pages and apps.

Traditionally, Android adopts 3 navigation buttons. Google ditched the Overview button and switched to navigation gestures for the stock Android.

You may navigate your device by using either the navigation buttons or full screen
gestures in Galaxy S21 series.

Steps: 

• Navigation buttons
  Use buttons along the bottom of the screen for quick navigation.
  1. From Settings, tap Display > Navigation bar > Buttons.
  2. Tap an option under Button order to choose which side of the screen the Back
  and Recent apps icons display.
• Navigation gestures
  Hide the navigation buttons at the bottom of the screen for an unobstructed screen
  experience. Instead swipe to navigate your device.
• From Settings, tap Display > Navigation bar > Swipe gestures to enable the
  feature.
• Tap an option to customize:
•  More options: Choose a gesture type and sensitivity.
• Gesture hints: Display lines at the bottom of the screen where each screen
  gesture is located.
• Show button to hide keyboard: Show an icon on the bottom right corner of
  the screen to hide the keyboard when the device is in portrait mode.
• Block gestures with S Pen: Prevent the S Pen from making navigation
  gestures (Galaxy S21 Ultra 5G only).