Multiple Display

[Firmino]

Hello,
I've started to use UltraVNC Recently and i need help with a multiple display issue.
I need to connect in a virtual machine Remotely. My desktop (where the UVNC viewer is installed), have 3 monitors (So, my max resolution is 5760x1080), but, when i connect to the virtual machine, its only appears in one of the monitors, and the other two remain with a black screen.

Thanks
F.F