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Disable location field

You can't as there is no category setting to disable the location field.

The only thing you can do yourself is edit the Create and Edit article templates and remove the location field input (this obviously disables it for all categories) OR wrap the input with conditionals to not display the input if it matches specific categories IDs (Brogan has a RESOURCE on conditionals that explains how to do a conditional against multiple IDs).

There is an existing suggestion to add the ability to enable/disable location on a per category basis, so you don't need to create another one.