Here you can see it works on first usage:
After I have used it once it no longer shows all options
Hey @bhiltbrunner 
Welcome to the Postman community! 
Could you raise this on our public issue tracker, please?
It’s the best place to get functional issues in front of the team.
So is this a defect then? I assumed it was a PEBKAC problem, ie I was doing something stupid.