Affordance to see/change Home Artboard in design mode.
Currently there is no way to know which artboard is the "Home Artboard" outside of Prototype mode, and there's no way of changing it in design mode.
I make a lot of presentations/decks in XD and I don't often use prototype mode. When I share a prototype/deck I assume the first slide is going to be the artboard in the upper left because this the default order for unlinked artboards in XD: left-to-right, top-to-bottom.
I currently don't have any visual indication (in design mode) as to which artboard is my "home artboard." Which means sometimes I don't know that my artboards will be exported out of the intended order until after I share the prototype.
I also don't have a way to change the Home Artboard in design mode, something which I expected to be able to do without entering prototype mode.
Lastly, I wasn't familiar with the concept/term of "home artboard" and couldn't easily find out how to change my first slide using Google.
Home artboards are now marked by flows, so you should be able to identify them in Design mode.