However you have to activate it in the settings under "Eye Control < Smart Teleport < Enable Mouse Teleport to secondary screens". This is disabled by default.
Please note that NUIA can only teleport the mouse pointer to your secondary screens (i.e. where NO eye tracker is mounted) in rough form. There are no gaze data available for the secondary screens, as an eye tracker can only cover one monitor in principle. However, the gaze data is usually sufficient for up to one third of the adjacent monitor. NUIA uses this data and transforms it to secondary screens. So you can have your mouse pointer teleported to secondary screens anyway (but with inaccurate gaze data). The teleport from secondary monitors to the main monitor has no limitations.
Equal sized screens with the same resolution are optimal.