DX11 and DX12

I would like to experiment HBAO+ but it only works with DX11. Looks like DX12 is the default settings. Where can I change it?

as far as i know dx 11 is the default, you have to launch the editor with the --DX12 flag in order to use dx12
when you open your project, open the output log and search for “LogD3D11RHI: Chosen D3D11 Adapter: 0”
if you really are using DX12 it will say “LogD3D12RHI: Chosen D3D12 Adapter: 0”