Yeah, it doesnt work for DX12, just do that:
-> delete the file "dxgi.dll" and "F1_2019_dx12" in the F1 2019 folder
-> open steam
-> right klick on F1 2019
-> choose "properties"
-> go to the register "Local Files"
-> click on "Check files for Errors"
NO, DX 12 will not work, only DX 11!