Fine-Tune the Calibration of the Pro Display XDR on Mac →
Apple Support:
On your Mac, you can fine-tune the current calibration of your Apple Pro Display XDR by adjusting the white point and luminance to more precisely match your own in-house display calibration target.
Meanwhile, Apple still hasn’t fixed automatic contrast adjustment (Ambient Light Compensation), which totally wrecks the calibration of Mac screens, when Displays → Display → Automatically adjust brightness is turned on. I wonder if this also applies to the Pro Display XDR.