Dell UltraSharp 38" 1600p Curved Monitor - Manual (Page 66)

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