(Edit: deleted confused previous explanation)
The docs say this:
The StaticSwitch expression works like a StaticSwitchParameter, except that it only implements the switch and does not create a parameter.
So, you need a StaticSwitchParameter to be able to set something up, and then you can use this switch to choose one value or the other based on an input value such as that parameter.
You might want to set these up as material instances, so you can create one instance with it “on” and one with it “off”
