There used to be additional controls but we lost those when Xara added Autofit to Page.
There is an easier way, import a Text Panel from the Online Content Catalog (See attached). These Text Areas are set up to automatically expand as you add or remove text and you can alter the text and remove the outline from the text are if you want.
If you set the text area to Push then it will expand or shorten the page as you add or remove text.
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