Tote Vision LCD-1700VRQ - Manual (Page 20)

________________________17” Quad display LCD monitor
18
Pressing to let screen to display 4 channel quad display.
Recording the screen will always set as quad display, When you
playback the screen, we offered one hot key to let user to see the full
channel # display. For example, if you want to see the playback
channel 1 in full screen, just pressing ?/CH1, the screen will show
the full screen of channel 1.