Android design problem

[AtaolArslan]

 Previously, I mentioned this problem on the navigation keys of android have more parts. Now you can see another clearer picture

My phone model General Mobile Gm8 Android version is 8.1 oreo. 8.1 When the oreo update came this was the way

It's in the photo. There is a black space in the navigation bar when the phone is in power saving mode

Normally the navigation buttons should be up to the red area but there is a redundancy

I'd appreciate it if you fixed this.