clarification on startalone option

[zfwf]

OS: Ubuntu 16.04
hyperterm-overlay: 0.4.0
hyperterm: 1.3.1

How do you start Hyper with just the overlay window (not also a Hyper window created at the same place). The documentation suggested making "startup": true and startAlone: true but still get a Hyper window.

I think this is the purpose of the unique flag, but for some reason enabling it causes hyper to stop working. Not sure what the deal is.