Do not let Client Users Access a project

Do not let Client Users Access a project

I am brand new to Zoho and love everything so far, especially the ability to connect projects to unique contacts in ZOHO CRM plus!  We are have a set series of tasks that must be completed per customer and that is why we are using ZOHO projects.  I would like to see which contact is associated with a specifit project on both the project and on the contact record.  

I DO NOT WANT THE CONTACT TO BE INVITED TO A PROTAL TO VIEW THEIR PROJECT!  

Is there a way to not invite a contact to view a set project that they are linked to?  Perhaps there is a setting we are missing?  Can we simply turn off the portal?  If we associate a client account (and then client contact as a sub-account, would that work?)

Whatever you can do to help is appreciated...

Stephen