Smart Viewer Supports up to 2 monitors for displaying the live view cameras in real time (maximum of 36 live video streams).
The dual monitor feature must be enabled first from the viewer settings.
Step 1: Click SETUP and enable "Dual Live Monitor"
Step 2: Click on the "Dual Live Monitor Icon" displayed on the top right menu. This will open a 2nd Smart Viewer window that you can drag or bring to your 2nd monitor. 
Please click on this link to access Smart Viewer User Manual