You can get the three-button navigation bar back on Android by opening Settings and selecting 3-button Navigation under ...

In the next screen, tap Home to check it in the list. With the AssistiveTouch virtual button enabled, simply touch it and it will behave just like a physical Home button.

Future Galaxy phones might finally ditch the button navigation by default, and swipe controls could take over setup.

Samsung typically uses the three-button navigation by default, but in One UI 8.5, the company could move to gestures.