looks like you need to change $23. That means you have to get to the settings for 0 through 7 in the axis configuration table chart.
GRBL_Settings_Pocket_Guide_Rev_B.pdf (diymachining.com)
see my post in this thread if you don’t know how to get to the settings.
Calibrating my X-carve 1000 - X-Carve - Inventables Community Forum