A:Answer When you have your Xbox One X connected to a 4K TV, the Xbox determines the capabilities based on the TV, but there are a few settings you can adjust.
You can go to Xbox button > System > Settings > Display & sound > Video output. The settings vary based on the TV or Monitor. For this TV, there are settings for resolution (4K UHD, 1080p, & 720P), Video modes, which includes an option to allow HDR10, Video fidelity & overscan, Calibrate TV, 4K TV details, and Help. For me, under 4K TV details, it shows that it supports HDR10 (4th setting under videos, just above the circle with a line through and 2nd setting under games). The settings images were taken while Forza Horizon 4 was running--it looks amazing. If you are planning to run the video through a capture device, depending on the device, you may lose 4K and/or HDR10.
