I want to remove a field from a custom form, but can't
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The form field is saying "That field cannot be deleted because it is being used", but I no longer want this field to be part of my form.
How can I remove it?
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You are trying delete the field, instead of just removing it from a form. You cannot delete a field when a form is using it.
If you do not want a field displayed, you must remove it from a form.
Then, if you would like to delete the field definition you may.