Topic on Talk:Final Fantasy VII Remake Intergrade
No one mentioned it because that solution is already written in the main page about FFVII Remake, no one cried anyway, please avoid offending people without a reason, if someone breaks a rule is good to alert them about the risk of being reported instead of doing it directly (I have nothing against you, just explaining).
That aside, you're right, -dx11 can be used as a simple command line through Epic Games Store "Additional Command Line Arguments", but from what I've heard it doesn't solve the problem the OP has, thanks for pointing that out anyway even after all this mess