Dell U3219Q Display Manager Users Guide - Page 7

You can use the dropdown list to switch to any input source. NOTE: DDM communicates with your monitor even when the monitor is displaying video from another computer. You can install DDM on the PC you frequently use and control input switching from it. You may also install DDM on other PCs connected to the monitor. Click the PIP/PBP mode selection button to set the preferred configuration. The available modes are Off, PIP Small, PIP Large, and PBP. Dell Display Manager User's Guide │ 7