Display in Browser Window

If I set up a presentation in a bounded window, say 895 x 675 pixels, I would have hoped that when this was displayed in a browser window, it would frame the content in such a way that the display area matched the bounded window.However Saba doesn't seem to do that - If I 'preview in browser', the whitespace extends indefinitely past the header, footer and margins of the display area - is there some setting that I am missing?

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