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Switch to the Display tab (under your primary graphics card). Look at the Feature Levels line.
Note: Older integrated graphics, such as Intel UHD 620, do not support Ultimate features. 2. Update System Software
You don't. You verify.
If you have the correct GPU, Windows 11, and the latest driver, DX12 Ultimate is . There is no registry hack, no PowerShell command, and no "Ultimate Mode" toggle in Settings. Microsoft designed it to be invisible.