Yes enhanced sessions are a very new hyper-v feature with a somewhat awkward interface… to the best of my knowing only the latest server 12r2 and windows 8.1 builds support it.
@Sonny, could you fire up your windows 10 (remotely) for me and press the view tool bar option… is enhanced session grayed out like it is in this screenshot mate?
I don't have the normal Win 10 Tech Preview install anymore in Hyper-V but I do have Windows Server Technical Preview Build 9841 running in Hyper-V and enhanced session mode seems to run fine. That would be the equivalent of the initial version of Windows 10 Tech Preview, just the server version. I configured my settings according to this page here http://www.virtualizationadmin.com/...nced-session-mode-windows-server-2012-r2.html Both in Hyper-V manager and in the VM settings and it seems fine.
ussnorway, I could not find view tool bar option but was able to find enhanced session and it was not grayed out. In fact I clicked on it and right now it is working fine. I am running Build 9879.