VPT splits into interface, preview and output windows, and only the output goes on the projector
VPT 8 presents three separate windows and it matters which is which. The interface is where you edit — layers, sources, controls. The preview window shows the composited result on your own monitor so you can work safely. The output window is the one that goes fullscreen on the projector; you drag it onto the projector display first, then go fullscreen with the fullscreen button or the Esc key. If you go fullscreen before moving the output window, it fills the interface display instead of the projector. This three-window split is why the projector must be an extended (not mirrored) display, and it lets you keep working in the preview while the audience only ever sees the output.
Examples
Drag the VPT output window onto the projector, confirm the composited image in the preview on your laptop, then press Esc so only the output window goes fullscreen on the projector.
Assessment
Name VPT’s three windows and say what each is for. Which one goes fullscreen on the projector, and what goes wrong if you fullscreen before moving it there?