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In mysonicwall; Product Management / My Products / Product details, "Managed By" isn't editable. (see above).
@BobWHill do you have a license for NSM (Essential or Advanced) attached to this unit? IMHO this is a requirement to modify that option. Zero Touch has to be enbled therefor.
I don't have any unit with NSM at my disposal to check further.
Check this Video at 1:15, where you can see the options available with a valid license.
It's supposed to have the Essential license - I'll double check.
I've enjoyed and benefitted from your videos in the past.