NewTek TriCaster 8000 - Manual (Page 363)

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If you have a secondary monitor connected to TriCaster, you can drag SpeedEDIT’s
Video Output window (opened from the Window menu) onto that screen.
Maximize it by double-clicking inside the preview area (double-clicking a second
time restores the standard ‘floating’ window).
Similarly, you might find it convenient to maximize the SpeedEDIT window to fill the
primary monitor display. To do this, double-click the window border. In this
configuration, the Desktop exit button is not available, but you can exit the
application using the File menu’s Close item.