Hide notifications and icons

Hey, Thanks for posting the query.

Please navigate to the Policies tab. You can create a new policy/choose to edit an existing one. Select Android–>Advanced Restrictions –>Display Settings. The Display Settings have two options beneath:
Hide Status Bar: Hides the status bar (notification icons, network signal bar, time, etc.) at the top of the handset screen. Hiding the status bar will deny access to the notifications bar and the quick settings tray.
Hide Navigation Bar: Hides the on-screen navigation bar with the back, home, and recent apps buttons.
Enabling the corresponding checkboxes will activate these restrictions and in effect, the notification icons and navigation bar will be hidden.

Please use the link for reference.

Cheers!
Grace Baker
Hexnode MDM