Barely mentioned in Windows settings just HDR "Supported". Dolby Vision is just an HDR variation, settings in the Dolby Vision App.
You will also need to be watching Dolby Vision content.
Change settings on TV to enable the feature, get the PDF manual, or search YouTube etc.
My Laptop display is all integrated and supports HDR and indeed comes with HDR calibration profiles and the Dolby Vision App.
I don't see it in the MS Store.