take a look at these, hope it helps
The buttons never worked for me, there are a lot of threads on this in the forum.
You can set the Xcarve in machine inspector so it will apply torque the the motors when the machine is idle. This way you can change bits and nothing will move while you are doing it
Machine
Advanced
Machine inspector
Type in $$ and press Enter, a list with the different GRBL $ values will show. Check $1, if anything other than 255 change it by:
Type $1=255 and press Enter.
Power Xcontroller OFF->ON and check the listing once more to confirm new value.
Done
Dip switch #4 for each axis. OFF = Idle Current mode is OFF, stepper get full power all the time (governed by GRBL $1)