I can remove the bottom-right div on that screen.
As far as other lockdown, you can set User-level Module permissions using Report QMX User Module Permissions. For example, if you had a user named "CuDisp", then add a line to the Report as such:
Then use the associated User Pin to login to that Device.
Trying to access any other module will throw the user to Main Menu. The Main Menu and Module Menu will both have only 1 option available: Customer Display