As we transition to the new Hyland Community, some post links may be temporarily disrupted as we finalize redirects. We apologize for the inconvenience and are working to resolve this as quickly as possible. Details.
1. Hide the button all together for everyone. (Probably not the best).2. Hide the button for users who's email address doesn't end with your company email. (Or something similar to distinguish internal users from external users).3. Add custom aspect to external users and filter by that when rendering the Sites dashlet.