Larian Studios Forums Baldur's Gate III Baldur's Gate III - Suggestions & Feedback HDR mode--DX11--it's excellent!

The HDR options are only there if you launch the game in DX11 mode (not the default Vulkan mode.)

Also FYI the HDR calibration has been broken since patch 9 - you just get a black screen for the 2nd set of calibration options (contrast and paperwhite) so you can't actually see what your changes are doing.