Dell UltraSharp 38" 1600p Curved Monitor - Manual (Page 68)

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Operating the monitor
USB Switch Select to switch between the USB upstream sources
in PIP/PBP mode.
NOTE: The feature is available only when the PIP/
PBP mode is enabled.
Video Swap Select to swap videos between the main window and
sub-window in PIP/PBP mode. Press the
joystick to
confirm the selection.
NOTE: The feature is available only when the PIP/
PBP mode is enabled.
Audio Allows you to set the audio source from the main
window or the sub-window.
NOTE: The feature is available only when the PIP/
PBP mode is enabled.
Contrast (Sub) Adjusts the contrast level of the picture in PIP/PBP
mode. Move the joystick to adjust the contrast level
from '0' to '100'.
NOTE: The feature is available only when the PIP/
PBP mode is enabled.