The Public Forms feature is a great way to share forms externally through unauthenticated links. However, as an IT department responsible for governing information leaving your organization’s tenant, you may prefer to restrict this functionality.
With Team Forms, your IT department has direct control over which features are enabled or disabled. If you’d like to disable public sharing, you’ll need to be on the Enterprise Plan. From there, simply reach out to your account manager to have this setting adjusted.