To disable multi-display cloning
From the NVIDIA Control Panel Select a Task pane, under Workstation, click View system topology.
Locate the Quadro product that has the DisplayPort connection that supports multi-display cloning, then click the corresponding board [+] icon to expand the branch.
At the DisplayPort status property, click Multi-Display Cloning (Enabled).
The Multi-Display Cloning dialogue opens.
Click Disable.
Multi-display cloning is now disabled.