VIEWSONIC Elite XG340C-2K 34" 1440p HDR 180 Hz Curved Ultrawide Gaming Monitor - Manual (Page 28)

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Key Description
[ ► ] 1 Press and hold the key for 5 seconds to lock/unlock the Power
button.
When the menu appears on the screen, continue holding the key
for 10 seconds to lock/unlock the Power button.
Locking Power Button
Press and hold for 10s to lock Power
If the Power button is locked, the below message will appear on
the screen:
Power Lock/Unlock
Power Button Locked
[ ▲ ] Press and hold the key for 5 seconds to display/hide the boot up
screen when the device is turned on.
Boot Up Screen On/Off
Off
Press to Turn On
1 - Only pressing this key will enable the Input Select function. Under PIP/PBP mode, it will enable KVM switch.