OK i thought maybe my implementation or my PC at work - so I just tried the 3.3 beta template on my home computer and clicked on “play in current viewport”, also tried “New pie window” and “Play in standalone”. But none of the keys work - even though no HMD is connected.
I will download the new 3.3 you just posted and try again tomorrow. Any flag or parameter i have to set to enable the No HMD mode?