If you see it there, it’s already enabled.
There is no global "Master Switch" to force DirectX 12 Ultimate on for every game. Developers must code for it. Once your system passes the checks in Step 3, compatible games will automatically detect it.
What to look for in Game Settings:
For Windows 11, DirectX 12 Ultimate is actually delivered via Windows Update and your GPU driver updates, not a standalone download.
1. Update Windows 11: Microsoft bundles the DirectX 12 Ultimate APIs into cumulative updates. how to enable directx 12 ultimate in windows 11
2. Update Graphics Drivers: Windows Update often lags behind the latest GPU drivers. You must manually update your drivers to "unlock" the feature flags.
For a more user-friendly confirmation than the archaic dxdiag tool, Windows 11 offers a modern interface. If you see it there, it’s already enabled
Here, Windows will give you a definitive "Green Checkmark" or "Red X."