I agree with both of you re the hidden Spaces bar. What I was referring to was something more basic. In the runup to El Capitan, one of the rumoured "changes" was to the display of open windows on the current desktop. They said they would no longer be stacked. That seemed odd to me, since you already had the option of keeping the windows unstacked by unchecking a box in System Preferences, but I thought Apple might have some sort of innovation in store for us, and was eager to see what it was, since I've always been a bit unsatisfied with Mission Control. But what I see is no change whatsoever in that respect, unless I'm missing something.