On Android device, ZenScreen has a special permission from the OS to be able to monitor app usage and what is going on on the device. That is very important to provide full protection to the kid's device.
As a result, Android automatically puts that notification banner in the system tray.
We take advantage of that banner and tell a kid some important information about the product like "10 mins to bedtime", etc. So that banner is very useful.
However, if you prefer to remove that banner, click on settings and disable notifications. Banner will go away but ZenScreen functionality will keep working.