Gmail gains new gestures on Android in the latest update
Swipe actions menu.
There are different actions that you can set your swipe gestures to do, such as Archive, Delete, Mark as read/unread, Move to, Snooze, None. You can have up to two of these actions enabled at all times: one on the right swipe and another one on the left swipe.
The update isn't available via Google Play Store, so you'll have to wait for Google to enable it via a server-side toggle. It's yet unclear how long it will take for the update to arrive on all devices, but it looks like it's been rolling out for about a week or so.