Yes, there is an easy way to do that. As a space administrator, you can view a list of all restricted pages in a space. To do this, click on “Space Tools” at the bottom of the sidebar, and then “Permissions.”
Here, select “Restricted Pages” and you can see the list of restricted pages and the type of restriction in that space.
More the visual type? Watch our Video #85 of the Video Tutorial Series “Learn Atlassian Confluence” or check Page Restrictions of Atlassian’s original documentation.