Sorry, I’m not sure I understand the question, sorry for my ignorance. Do you mean if I boot on the integrated graphics? I don’t know how to be sure that I am.
All I know how to do is plug into either the GPU or the mobo haha.
But when both monitors are plugged into either the GPU or the mobo, they both are recognized (provided that I enable that setting in my BIOS - if I don’t do that, then I get blank screens when plugging into mobo).
Not sure if needed but this is my mobo: https://www.msi.com/Motherboard/Z490-A-PRO