The answers you’ve already been given are correct for an external reference monitor – but from the way you phrased your question it seems like to me you were asking about monitoring on a second display (you said instead of dragging your canvas into the window, and you generally don’t do that with an external ref monitor).
So I’m going to answer the question as I understood it – and the answer is pretty easy. In Final Cut, go to View > Video Playback > Digital Cinema Desktop. If you have 2 monitors hooked up to your mac, you’ll see 4 options. You can choose which screen the image gets played back on as well as the sizing of the image. After you’ve made that selection, just turn on video for all frames (CMD+F12 or View > External Video > All Frames) and you’re set.
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Paul Escandon
Producer | Director | Editor
Apple Certified Trainer – Final Cut Pro
Oremus Productions
http://www.oremusproductions.com
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Adjunct Professor of Media
John Paul the Great Catholic University