Dell U3821DW 37.5" 21:9 Curved IPS Monitor (Silver) - Manual (Page 51)

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