I found an IR asking for this previously and it says it was implemented on June 18th. But the only thing I can figure out is that I can resize the flat view to take up roughly 3/4 the area of the main window. I would really like to be able to actually have the view windows swap when working in the flat pattern as it takes up more screen real estate when it is unfolded than it does when it is folded. Maybe I'm weird but I don't work on my model with the flat pattern window expanded except when I'm converting a solid and making sure I'm selecting the right edges to bend.
I will pull you onto our internal tracking for this.