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Conditional Read Only
Field Settings >> Conditional Logic >> Show/Hide
I propose a third option, Read Only, that would allow us to conditionally prevent a field from being edited, until a desired condition exists.
I might use to be less disruptive to the user experience than making a new (surprise) field appear.
Example: Insurance or medical form
Checkbox 1: Male, Female
Checkbox2: Pregnant? (Conditional logic: Read Only unless Checkbox1 is equal to Female.