so the work zero button is set during the carve setup…(and when the machine is first turned on) there are a few other ways to set it, but not without manually typing in commands into machine inspector…
Those 2 position buttons are really there to assist with repeat carvings,… to move the spindle back to work zero after a bit swap and homing the machine… (which is a requirement on X-carve Pro since you Cannot Bit swap while the CNC is powered on per the safety manual)
Also, you only see those buttons because you have beta testing turned on, those buttons are not available to all users, there’s a thread in the beta category of this forum discussing the feature a little… Beta testing for new Machine Controls - #3 by RichardDMusser