Well that is not right. Did you log on your user name from your 'mysteinberg' account? Where you register and get your downloads? Maybe they connected you with someone else. I suppose I could ask for you but sure it just something....
Cubase is actually best used with 3 monitors, but not everyone has that ability. There are more options for splitting screens in Cubase 9 and 10 for those with laptops or only one screen. Get as big of a screen as you can squeeze in your space.