Just in case you missed any of the previous....
Microsoft, having tried to convince us into upgrading previously, and failed, now decides to go Full-Screen. At least it has a “Don’t notify me again” capability.
It leaves one wondering if they will honor the request, and not notify bug us any more if we click that text.
If you’re running Windows 7, and want to stick with it until it’s projected end of support in 2020, this may be the way to finally stop the constant onslaught of upgrade requests.