Why is UE4 Trying to use DX-11?

I have DX-12 Installed and when I launch UE4 It crashes and says there is an issue with D3D-11. I have tried to uninstall UE4, DX-12 and reinstall them both. The error still occurs. Can someone help?

UE4 still use DX11 as default renderer to enable DX12 you need to run editor in -d3d12, DX12 is backward compatible and should work with DX11 application.

I think your issues is not related to installation of DirectX, please describe what exact error do you get, also look in logs (Saved/Logs in you project directory) if there issues with rendering or drivers it usually being print out there