Google Assistant is getting a new feature on Pixel 4
Starting today, Pixel 4 users can add another new feature to the list of exclusive improvements they benefit from: support for three-button navigation. The latest Google app, which isn't even the most stable, is adding three-button navigation support for Google Assistant, which can be triggered using the hotword (Ok Google) or hold your finger on the home button.
AndroidPolice reports that the new change might not be active on all Pixel 4 units yet since this seems to be a server-side rollout. To make sure that you're able to use the new feature, you have to go to Settings on your Pixel 4, then head to System and tap on Gestures. You'll be presented with three choices, but you want to select 3-button navigation.
With 3-button navigation, you can switch apps with buttons at the bottom of the screen, go Back or Home. It's a different way to control Google Assistant that doesn't involve gestures, but if you don't like, you can always return to gesture navigation.