The apples flagship iphone x that was made bazeless. It has an ugly notch at the front top. People have been trying to get over this notch since it was launched. The notch cannot be covered because the notifications and shortcuts are operated from there.
So, for covering the notch there are many apps on apple app store. These apps are working by changing the display settings.
These apps are optimizing it so that the notch cannot be seen. Such that changing the color of the front end. The screen is squeezed from the top. Moreover jail break is not required for doing this.
These apps also give the access to change the wallpaper and lock screen.