Yes it wouldnt switch on in Windows if it were not enabled on that input.
I've ran this out of the box, and against other recommendations on the net. There is not a lot of control over the settings to be honest so we can't be too far from each other.
My experience so far is that HDR does not offer a major upgrade in colour vibrancy compared to the upgrade to OLED.
It does replicate the way our eyes perceive darkness against bright sources, but that's actually a flaw in our senses.
Why would I want to gimp my vision on screen, just because it looks more like real life? When you have that experience in real life, you automatically try to block out the brightness so you can see the detail in the darkness.
If you're coming from a TN panel to something with HDR, I'm sure it will look amazing in contrast. Whenever I've been watching TV/playing a game on the OLED, I feel this monitor is quite flat in colour. And it's a beast of an IPS.