I can see the computer screen and the same image on the projector
Are you saying that what you see on your computer screen is exactly what you see on the projector (mouse cursor appears on both)? If that's the case, you'll need to setup separate dual displays, hopefully your laptop supports dual display.
Just need you to confirm this is the case before we step you through the setup procedure. There might already be some documentation on this in the ZionWorx's help file.