Vivotek ND9542P 32-Channel 4K UHD NVR (No HDD) - Manual (Page 48)

VIVOTEK - Built with Reliability
48 - User's Manual
4. You can change the screen information by entering a string of your preference, such as,
"Masking is mandatory!."
Note that you will need 3 sets of image combinations for 3 levels of occupancy.
5. When done with configuring all screen panes, click the Apply button on the upper-right
of your screen.