Switch to a new PC

Hi,
I just bought a new pc and moved both my C drive and my drive with fs2020 to the new pc but now fs starts up in only the middle one of my 3 screens in a strongly compressed form - and just as the game is about to ending upstart, the PC crashes and restarts.
The compressed form seems to show that the graphics setting in fs is for 3 monitors (3840x1024), but that the new g-card does not read that setup - does anyone have any good advice?
I really hope so:-)
My new g-card is a MSI RTX3080 - (should be a good one, maybe)
Kind regards
Jorgen, Copenhagen