Dell U3821DW 37.5" 21:9 Curved IPS Monitor (Silver) - Manual (Page 59)

Operating the monitor
│
59
OSD warning message
When you select the USB Switch hotkey from the Menu Launcher, the following
message appears if the PIP/PBP function is disabled:
Factory Reset Restore all preset values to the factory default
settings. These are also the settings for ENERGY
STAR
®
tests.