Page 277 - ProShow Producer 9 Final Manual
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276 10. Captions
To enable this option, just check the Shrink to fit box, located in
the Caption Format pane.
Revisiting the example:
Even though you haven’t made all of your design decisions yet, by setting
up this text box, you’re able to make sure your text will always appear in this
specific part of the slide, regardless of the font, font size or amount of text
you include in your caption.