Disable DFS tab
User Configuration\Administrative Templates\Windows Components\Windows Explorer
Removes the Distributed File System tab from Windows Explorer.
This policy removes the Distributed File System tab from Windows Explorer and from other programs that use the Windows Explorer browser, such as My Computer. As a result, users cannot use this tab to view or change the properties of the Distributed File System (DFS) shares available from their computer.
This policy does not prevent users from using other methods to configure DFS.