Note: If you want to know how to create a multi-user account, follow the steps within the article: How can I create a multi-user?
In your Regiondo Dashboard, go to Settings > Multi-User Access. On the right side, click on the recycle bin to delete the account, then on Yes.
Important: Once deleted, a multi-user cannot be reactivated, but it has to be re-created, if needed.
Note: A deleted multi-user, is switching to a customer account only. So it is not completely deleted from the system, but it no longer has access to your Dashboard.