3d preview on 2nd monitor

Hi is the feature actually implemented? I have connected a second monitor, the feature is checked but I actually can’t see another windows.
I’m using 2.3.6.2 pro 64.

If you go to the view drop-down there is an option to Open Additional Window. You can use this on your second monitor.

Great! thanks

This menu item is greyed out. How do I get it to work? Thanks.

As far as I understood, this is a feature of the Pro version.

Correct. Thanks for clearing that up.