Q-See QSC13212D - Manual (Page 15)

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4.2 On Screen Display Switch
ENTER Press to Enter or Exit the menu
UP/DOWN Tilt toward UP and DOWN to move up and down in menu
LEFT/RIGHT
Tilt toward LEFT, RIGHT for modifying the menu parameters
，
press RIGHT to move to the next menu and modify the parameter.
5. OSD (On Screen Display) Operation
Press the "OK" to enter main menu, if the button is not pressed for 90 seconds,
the main menu will disappear automatically from the screen.