This article explains how Google Pixel 6 and Pixel 6 Pro users can switch between gesture-based and button-based screen and menu navigation.
Google Pixel 6 and Pixel 7 – How to add on-screen navigation buttons?
One of the biggest draws of the Pixel 6, and the Android ecosystem as a whole, is the ability to customize it exactly to your liking. One major change you can make is how you navigate each screen, with gesture-based navigation or a more retro three-button navigation style if your two choices are.
If you prefer the classic look of three buttons at the bottom of each screen, here's how to enable it through Android's system menus.
To switch to the three-button navigation method, first open your Pixel 6’s Settings app.