2 Video cards, and the game won't launch

I have 2 graphics cards installed on the machine, and only use my nvidia geforce rtx 2060 for gaming (yeah I know it’s old, but still works on medium’ish settings for most games).Main monitor NVIDIA GeForce RTX 2060

Secondary monitor AMD FirePro V3900 (crappy thing that was lying around, and takes strain off the nvidia for dual monitors)When I launch the game, I get an error that it Failed to Create DirectX 12 Device for the following Adapter: AMD FirePro V3900, I DON’T USE THIS CARD FOR GAMING!! How can I tell it to launch on the NVIDIA card?

Is there a command line switch I can use?