How can I use Reachability on iPhone X and later?

Reachability can make one-handed use of the iPhone easier by bringing the top half of the display down to the middle of the screen. To use Reachability on the iPhone X and later:
- Enable Reachability under Settings -> General -> Accessibility -> Reachability -> ON (green slider)
- Swipe down on the gesture bar at the bottom of the display