Hi Peter,
After enabling homing in GRBL by following the Homing instructions linked to by @WillAdams ie;($22=1)
To enable the Homing cycle before jogging in Carbide Motion you go to settings window and click TRUE on the line that says: SHAPEOKO HAS HOMING
FYI if you have an XL the table dimensions should be set to 850 X and 430 Y
For the XXL the settings would be 850 X and 850 Y and look like this:
