By default, apps avoid the banded area across the front camera, but you can set your apps to use full screen and stretch across the entire display.
You can turn it on or off for individual apps or all apps.
Adjust the settings:



If you don't see the change or it doesn't display correctly, do either to close and restart the app:
If you're using an app and want to toggle full screen on or off, you can do it from the recent apps list:
Drag up from the bottom of the home screen, hold, then release.
Or, tap 
Tap Full screen to switch it on or off:

