+1 from me on this RDP/title bar issue. +1000. Aw heck .. +googal
Like many posters here I too have been living with that darn pop-down title bar for far too long, for many reasons already posted. Yesterday I was RDP'd (using Metro/Modern/Store app) into work, and from there opened an RDP window (desktop app) to a client system. Second RDP opened full screen with that blue title/control bar in auto-hide mode. Could not hover the mouse high enough to get that control bar back, the Metro title bar kept getting in the way. I finally had to close Metro RDP and reconnect using desktop RDP long enough to get control back.
That was the last straw. I decided to search the web for an answer and found this thread. While I'm depressed that there does not seem to be a way to hide that thing, I'm somewhat comforted (but sad, really) that I'm far from alone in this frustration.
Thank you, whoever suggested right-clicking on the title bar. Far from perfect, but I no longer have to wait for it to go away.
Microsoft - please listen to your users!!! (yeah, it's feeling a little futile right now....)
Not that I want to in ANY way help Microsoft avoid fixing this issue, but you can always de-zoom your session in order to get to the top edge. It's far from a solution, but if you get caught like that again it will save you from having to reconnect.
-Forjo