I have recently installed Dorico Pro 5.1 (Windows version) and have been following the introduction in First Steps. I am now at the chapter on Playback and have openned that window noting that there is no Key Editor. What have i missed?
To show the Key Editor, open the lower zone: the key command for this is Ctrl+8. Once the lower zone is open, it will probably be showing the Properties panel, but you can switch to the Key Editor, by clicking this button: