P3421W, PIP defaults

Hello,

I am currently facing an issue with the Picture-in-Picture function on my Dell P3421W monitor and I am hoping someone could help me resolve it.

I have two computers connected to the monitor. The first one is connected via an HDMI cable and the second one is connected via USB-C.

PC RTX2080 HDMI out port --> HDMI cable --> P3421W HDMI in port

Dell Precision 5680 Thunderbolt 4 (USB C) out port --> USB C cable --> P3421W USB C in port

However, when I activate the PIP function, the monitor switches to the DisplayPort signal mode instead of HDMI. I need to manually change the source from DP to HDMI.

I am unsure how to change and save the default settings. Ideally, I would like to set up the PIP function so that upon activation, the monitor receives signals from both USB-C and HDMI. Specifically, I would like the screen on the left to display the HDMI input and the screen on the right to display the USB-C input.

Any guidance on how to achieve this would be greatly appreciated.