You can set View Permissions for each of your sites, meaning you can control who is able to access them. Note that Atlassian permissions still apply to all Atlassian content on your site.
Go to the Permissions tab
Head to the Refined Administration.
Click Sites in the left-hand menu.
Pick the site you want to work with.
Click on the Permissions tab.
Site Access
Setting view permissions on your Refined site does not impact any permissions already set on your Atlassian Confluence or Jira instances.
Public - Anyone can view your site, regardless of whether they are logged in or not. This setting is useful if your site is a knowledge base or public facing support site.
Support (only available if you have added a JSM project to your site) - Customers who are logged in to JSM can view your site, as well as your organisation’s employees with an Atlassian account. This setting is useful if you have a support site on which only customers with a JSM account can submit a ticket.
Private - Only your organisation’s employees with an Atlassian account can view the site. This setting is useful for intranets, for example.
You can also set View Permissions on a page-level: learn more.