I believe it’s the flow where a selection is active, so even when you move the view three flows over and have the cursor in view, the flow name shown in the title bar will only change when you make a new selection. I too would welcome a change in that (i.e. make the flow title correspond with the flow that’s actually being shown).
I’ve been thinking a little about the missing flow names in galley view. Perhaps there’s some kind of workaround?
Dorico has lyrics, notes, etc. Perhaps there’s a way to input visible text at the beginning of each flow somehow - any ideas?