Perfect Wiki doesn't offer an option of hiding a specific page inside one knowledge base. All the users who have access to a knowledge base by default see all the content inside it.
If you want to restrict access to a specific area of knowledge, you can relocate it to a different knowledge base with custom access rights 🦸♂️ How can I control who can access pages in my knowledge base?
The ‘Access & Share’ tab on every page shows who can see it today. To limit a page to some people, create a knowledge base for that team, set its ‘Who can view’ to ‘Custom Access List’, then use ‘Move page…’ to move the page and its subpages there. Readers, search and the AI Agent only see knowledge bases the person has access to.
Moved pages get new links, so old links and bookmarks to them stop working.