Sub Form Field Rule Action

**field_id** or **group_id** is required, but not both. Must reference the `api_id` of an existing field defined within `form_fields_per_document`. Cannot use with `group_id`. Trigger and action fields must belong to the same signer.

**group_id** or **field_id** is required, but not both. Must reference the ID of an existing group defined within `form_field_groups`. Cannot use with `field_id`. Trigger and action fields and groups must belong to the same signer.

`true` to hide the target field when rule is satisfied, otherwise `false`.