Dell UltraSharp U3821DW User Manual page 49

PIP/PBP This function brings up a window displaying image
from another input source. Press the joystick to
confirm the selection.
Sub-Window
Main Window
USB Type-C
HDMI 1
DP HDMI 2
USB Type-C
DP
HDMI 1
HDMI 2
NOTE: The images under PBP mode will be
displayed at the center of the split windows.
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Operating the monitor 49