https://wccftech.com/miui-9-global-beta-rom-iphone-x/

Apple sparked a new trend by eliminating the home button on its iPhone X smartphone. The company brought gesture-based controls in place of a home button. Now, Xiaomi is trying to bring some of these gestures to its existing full-screen smartphones like the Mi Mix, Mi Mix 2, Redmi 5, and the Redmi 5 Plus with the latest MIUI 9 global beta ROM 7.12.28.

Xiaomi is trying to bring the iPhone-X influenced gesture control to its smartphones to make better use of their big screens by reducing the dependability on the Home button for various functions. By doing so, the company seems to be making way for its upcoming phones that might ditch the Home button entirely in favour of the clean all-screen design.