Hi Hence,
In a BIM Server, every user who has a management role (project admin, server admin) can access the whole project tree, even if the user does not have a default role.
If you want to limit the users who can see a project, then make sure that the affected users do not have any management roles, and also make sure to remove the Everyone user group from the affected project’s Access panel and add the permitted users one by one. But in this case please note that these users – as do not have any management role – will not be able to share projects or upload libraries.
Otherwise in a BIMcloud, the permission system is more complex, so in that, you can easily set what you described.
Best regards,
Istvan
István Moharos
Manager, Technical Services
GRAPHISOFT