[Amy Watson Hexnode 3 October 2018 Amy Watson Moderator]

Hi Mike!
It is indeed possible to disable the notification bar via policy, but this feature is specific to Samsung Knox devices alone. Head onto Android Settings -> Advanced Restrictions -> Display Settings -> Enable Modify System Bars -> Enable Hide Status Bar.
If the devices are in Kiosk mode, you could disable the status bar from Kiosk Settings -> Peripheral Settings -> Enable status bar under Display settings.
For more details on different system configurations, refer to the Android Restrictions document.

Cheers!
Amy Watson
Hexnode MDM