You are trying to check or remove the flag of the setting "Prefill Contact Data" after the Form is created, but the checkbox is read-only.
SAP Marketing Cloud Edition
Reproducing the Issue
- Open the Content Studio App.
- Open any Form.
- Go to the Settings tab.
- Click on Edit.
The Prefill Contact Data checkbox is read-only.
The Prefill Contact Data is available to be checked or removed only during the form creation.
This is the expected system design. After the form creation, you cannot change this setting anymore.
Prefill Contact Data, form , KBA , CEC-MKT-MEM , Content Studio: E-Mails and other messages , How To