This question was posted in response to the following article: http://helpx.adobe.com/indesign/using/whats-new.html
Well, the first 2 options under "Persistent text frame fitting options" make sense and are pretty self-explanatory, but what does "No Line Breaks" mean? Are we just supposed to experiment to figure it out by ourselves?
Well, that's one way. It means that there will be no line breaks in a paragraph, so the text frame will expand until the whole paragraph fits in one line.