Doom would need to support Crossfire which it doesn't in either OpenGL or Vulkan so it would be up to the game developers to implement.
Go back to the 16.3.2 drivers if per app Crossfire isn't an option.
Thanks for your answer.
Ok for the Doom , i hope the developper will fix quiclky this problem of crossfire.
I can roll back to the 16.3.2 to have the option again but this driver start to become old !
I can see the crossfire is working regarding gpu-z and in others games like dirt the crossfire is working too.
So it's a showing bug only, but it dosen't give me the possibilty to manage the crossfire.