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I suspect there IS such a thing, I’m just not sure precisely what the command is. You can always just set the variable in the GRBL to keep the motors locked; (send, without the quotes “$1=255”) That will keep the motors locked any time the GRBL is powered up.
Homing in CP is not the same as setting G28.1, there’s a very good post here on the subject, you can find it here: