I notices that IDXGIFactory1 only add two interface from IDXGIFactory, which are EnumAdapter1 and IsCurrent.
1.So, what is the use of IsCurrent?
The IsCurrent
method is for dealing with cases where information about the outputs that is cached internally by DXGI is outdated, meaning you should create a new factory.
This comes up in the handling of HDR10 displays. You can see it's use in my implementation of DeviceResources for DX11 and DX12