If you'd like to add or remove restriction to a page in Confluence Cloud, you may have permissions to edit the page and 'Restrict' or 'Admin' permission in the space.
You can refer to the below article for a better understanding on this:
Confluence permissions not so easy than it seems like Sometimes some "other" permissions need to have a checked permission
Using Ultimate Permission Manager you can analyse the permissions you need e.g. for accessing restrictions on a page you need some others as ENunes mentioned. This addon listed all of the necessarily information for you in a central page. Even you can check a users effective (maybe grated by a group) permissions on site, space or a page level.
Try it for free, and if you have any questions, contact me.
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