Related to this old post.
On Studio website, Adaptive layout : Responsive by design section, on the Artboard 7 we can see that there is a vertical list, when the user is manually resizing the artboard at a moment the list is switching to horizontal. By this way you can build an artboard for all devices, instead of create one depending of the size of each screens.
Responsive includes concepts of min and max for widht and height, show and hide containers depending on the screen size (watch Bootstrap grid system).
I beleive that Studio can't allow us to produce what the website demo show. If Studio allow us to do it, could you provide us the InSpace Studio file as shown on the website?