Gidday Jay
Right click on your desktop>Properties>Settings (tab). Towards the bottom there is a checkbox for "Extend my Windows desktop onto this monitor". This will stretch your entire desktop over both monitors (including the task bar!) and will consequently allow you to maximize AC over both screens. Then you can place the 3D window on the other screen!
To extend your AC toolboxes, go to Options>Customize>Palette Shapes. To choose which other windows to show, go to Window>Floating Palettes.
Good luck mate:-)
Cheers,
Link.