I ran into a problem following instructions given at https://code.visualstudio.com/api/working-with-extensions/publishing-extension however, shown group Marketplace isn't available.
I just started my azure with github experience.
tried to follow instructions given at https://code.visualstudio.com/api/working-with-extensions/publishing-extension.
If you look at the image on the linked page you see the scopes have a scroll bar.
On your image there is a Show all scopes
button. Click it and scroll.