Just a warning as well, at this time, if you add a new dashboard, it will mimic the dashboard you selected. Basically at this time there is only one instance of a dashboard type. For example, if I added a duplicate dashboard type like in the image, all elements will reflect the other dashboard. So a change to one will change the other.

Yep - I've explored the implementation a bit and can confirm your comments. For now, the Control Group is hidden, which I had discovered in the screen config. The File group is hidden in the Screen set for now.