As a JSD agent I'd like to restrict Public knowledge articles view

As a JIRA Service Desk agent I'd like to limit the customer's view to a specific how-to article sent and disable them from being able to browse to other knowledge base pages, unless they have logged into the customer portal.

The goal is to prevent customers from accessing other articles mentioned on the side bar that may confuse them.

Our Knowledge Base is public to allow 'anonymous users' to view without login, because customers can email service requests to us. If a customer has questions on product A, I can send them a link to a how-to article for product A, but they can also see product B how-to articles which may confuse them.