I recently went through the process of changing the 4th dip switches to lock the motors for a tool change. You can do it easily. Here is the link. XController disassembly. With the nema 23 motors I got from inventables, the z axis stays put during a bit change.
Another thing I do is to make my home position( home with the switches…$H) the x0,y0 point on my drawings. That way if anything moves or go wrong, I can re home the machine to the original spot I started out at.