When I press the zero return button X axis and Y axis rapid back to home position. Z axis moves after x an y are at 0.0.
How do I set up Z to retract to zero position first ?
I don't think you can.
The way to go about this in regards to a workaround is to set a 'safe Z' height.
Then when you go to 0 it will move Z first to it's safe height, then move x,y, then move Z to 0.
I have mine set at 30mm above my work 0.