Hello, “Manage” is referring to the building and maintaining the namespace, in essence, it means the access to the admin panel for the namespace.
If by manage you mean unable to view it, or update it then you need to use those.
If they cannot read it, they won’t see it, if they can’t update it, they won’t be able to edit it.
If by manage you mean they cant make records, then you need to set that permission on the modules on the namespace.