How can I repress the node Portlets by Create User within exo-ecm?

Hi All,

I have an ecm portal built on exo-ecm. If I create a user as administrator "exoadmin" this user becam 2 nodes navigation Home and Portlets (with Workflow and ECM). How can I repress the node creation "Portlets" so I becam by user creation only Home node.

Thanks
abdel