Reachability made its debut with the iPhone 6 and 6 Plus, to compensate for the larger screen sizes. It has since become a staple feature of all iPhones (except the iPhone SE), including the iPhone X, XS, XS Max, and XR models. However, it's a little bit trickier to use since there's no Home button on these newer flagships.
Don't let the first impressions intimidate you — Reachability on the iPhone X, XS, XS Max, and XR, like anything new, just requires some practice to get right. Just make sure your iPhone X is running iOS 11.1 or higher (the XS, XS Max, and XR have iOS 12 by default), follow the guide below, and you'll be reaching the top of your Home button-less iPhone in no time.
Unlike every other iPhone, it seems the iPhone X, XS, XS Max, and XR do not have Reachability turned on by default. To enable the feature, you'll need to dive into your Settings app. Tap "General," then tap "Accessibility." You'll find "Reachability" under the Interaction section. Just make sure the slider is set to green, and you'll be all set.
If you're used double-tapping the Home button to activate Reachability, you might find Reachability on these newer models a little tricky, since, you know ... there is no Home button.
You see the gray bar at the bottom of the display? That's there for more gestures than just going home. If you swipe down from the bar, you'll activate Reachability. It makes sense on the surface — like you're pulling down the display.