Introduced with the OxygenOS Open Beta all the way back in January, the new gesture-based navigation system for the OnePlus 5T is now available for everyone thanks to the OxygenOS 5.1.0 update. Once this feature is enabled, the navigation buttons are hidden, and the user needs to swipe the display for Home, Back, and Recent Apps.
https://www.notebookcheck.net/OnePlus-5T-gets-iPhone-X-like-navigation-gestures.299330.0.html