VIEWSONIC VP3881a 37.5" 21:9 4K Curved IPS Monitor - Manual (Page 61)

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5. To change the input source, select the source location ( Top Source / Bottom
Source or Left Source / Right Source ) and press the 3 key.
6. Then press the 1 or 2 key to select the desired input source and press the 3 key to
confirm.
3840 X 1600 @ 60Hz
VP3881
Language Select
Resolution Notice
Information
OSD Timeout
OSD Background
Power Indicator
Auto Power Off
Sleep
Multi-Picture
ECO Mode
DisplayPort
Off
Quad Windows
PBP Top-Bottom
PBP Left-Right
PIP
Dual Color
Top Source
DisplayPort
HDMI 1
HDMI 2
TYPE C
Setup Menu Color Adjust ViewMode Manual Image
Adjust
Input
Select
Audio Adjust
7. To swap the two windows, select Swap and press the 3 key to confirm.