C3422WE, how do I configure USB-C and HDMI together under PIP/PBB Mode?

I have USB-C, HDMI, and DP going into the respective ports in the back. Yesterday, I was able to see USB-C and HDMI side-by-side using the PIP/PBB mode. This morning when I booted up, the monitor is forcing me to pick one or the other and DP is mandatory as the second source. I've toggled between all the options, but I can't get the configuration that was working yesterday.

Any thoughts?  Thanks.