Hiding the Workspace Directory Button 
In a workspace, you can choose the
(Workspace Directory) button in the tab strip, to navigate from the workspace to the Workspace Directory. You can hide this button by
configuring a property.
In the portal, navigate to .
In the Portal Catalog, choose .
Open the Configuration iView.
In the Property editor, in the Property Category dropdown list, select Enterprise Workspaces.
Set the value of the Show Workspace Directory Button property to No.
Save your changes.