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Actions related to the page navigation of users include adding a new page, editing a page/page layout. These actions are based on permission settings set to a page.
The page navigation of a user will be created automatically when the user is created (registered).
Only the user who is the owner of the user page navigation can edit it.
No one can create a user page navigation so that no one can delete it. The navigation will be deleted automatically when its user is deleted.