From OOP Help:
I like using this view, with the first line only, and it would be really helpful to print like this, but I cannot find an option anywhere. Printing always outputs the row text in full. Am I missing something, or is it not possible?
You may choose to show all of the text in every row of your outline, or to collapse ("fold") rows you are not currently editing. "Folded" rows will only show the first line of their text.