There are two options I came across (and actually didn't use either because a good poke on the projector made it work well enough.)
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The words can be moved around using the theme definitions.
The screen can be limited by the menu I pointed at earlier.<br><br>Screen limits affect the video and words, PPT does it's own thing...
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One thing that I'd like to suggest as a useful setup feature.. is the ability to have the theme 'adjust the borders' actually sent to the projector, so that you can see what you're doing rather than guessing all the time.
Having the screen limits similarly sent to the relevant output would also be good.