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

How to set up an Action Button on Android with a mapping app Most features with customizable buttons on Android phones are part of the touchscreen. That's nice, but not exactly an Action Button.

Google is preparing some new features for Android’s desktop windowing mode, including a button to minimize apps.

A new Google app beta tries removing the prominent Search button from the screen-bottom nav bar. Google appears to be experimenting with several alternate layouts for the navigation interface.