Open the main menu of the device:
Press and hold the round button with a square icon ■ at the back of the device and simultaneously press the volume down button located below the round button twice.
App Auto Launch Setting
Select Settings in the main menu, then choose Signage Display → General settings → Boot on source → Input → and in the dialog window choose Custom app.
Go back to the Signage Display section, open the Source settings item,
choose Custom app, then Select app, and choose MeetingRoomApp from the list.
Hiding the Navigation bar
Select Settings in the main menu, then choose Signage Display → General settings → and deactivate the Navigation bar item.