you need to tell windows to use HDR for your display, in settings. In real life, things are more complicated though. To get true HDR, you need a 10 bit display.

"Calibrate your HDR (high dynamic range) display for a better experience with HDR content on your Windows 11 PC. The Windows HDR Calibration app helps you improve color accuracy and consistency.

Microsoft’s Dynamic Refresh Rate can provide a smoother inking and display experience on its own Surface laptops, like the Surface Laptop Studio. But members of the Windows Insider testing group ...