Hello again, NickASniper, thank you for the reply requesting additional information.
Dx12 (DirectX 12) is one of the Rendering Hardware interfaces (RHI). I have an explanation and a definition below for your convenience.
Here is an explanation from the Unreal Public Roadmap:
“Dx12 is the recommended RHI for PCs in UE5. Engine support continues to mature on all fronts, including memory management, feature completeness, and stability. Some new features such as Nanite, Lumen, and Virtual Shadow Maps run more efficiently in DX12 than in DX11.”
Here is a great definition from Tim_Sweeney:
“RHI = Rendering Hardware Interface. It’s the C++ interface which the high-level platform-independent rendering code in Unreal Engine 4 uses to communicate with the several platform-dependent implementations that exist for Direct3D, OpenGL, etc.”
You can find this setting in your Project Settings by going to your project setting and searching for 'RHI".
I wish you all the best and look forward to any additional questions.