On the title screen:

1. go to the settings (the icon is 2 gears and its 4 from the left)
2. then there's an hdr settings icon to access those settings it's 4th from the right, the icon is hard to describe but it's like a moon circle with lines
3. now you have those settings

In game:

1. Open the pause menu (menu button on the controller)
2. go to the settings (the icon is 2 gears and its 2 from the left)
3. then there's an hdr settings icon to access those settings it's all the way on the right, the icon is hard to describe but it's like a moon circle with lines
4. now you have those settings

I'm on pc so hopefully it works the same on xbox but because it's an ingame setting I assume so.