Remmina rdp session - no toolbar and keyboard shortcuts don't work
Solution 1:
To exit full screen mode in Remmina, press the right hand side Ctrl key and f together.
Solution 2:
It's a bug, see https://github.com/FreeRDP/Remmina/wiki/Remmina-Usage-FAQ point 3
It's apparently fixed but not in the version that ships with yakkety.
As a workaround you can use HostKey+F (HostKey can be set in Edit > Settings > Keyboard and by default is set to the right Ctrl key). HostKey+F toggles the Fullscreen Mode and you can go back to your normal Desktop if the remmina-window is not in fullscreen.