If you downloaded the new PCSX2 and DirectX 11 is not in the renderer list:
While still available, DX11 is no longer the focus of development. It is considered less accurate than Vulkan and may lack some of the newest blending features. pcsx2 directx 11 plugin download new
If you have a modern PC (Windows 10/11 with a dedicated GPU), you should use Vulkan or DirectX 12 for the best performance. Only switch to DirectX 11 if you encounter specific graphical glitches or if you are using older hardware that doesn't support the newer APIs. If you downloaded the new PCSX2 and DirectX