Если учесть, что рост возможен только вниз, то куда, по-вашему, должна расти последняя на странице секция?

CR help

Раздел: Format Line tab (Format Editor)

Move to bottom of Section when Printing
This option is typically selected when you are printing a line next to a field that may produce variable length output (a memo field, for example) and you format that field using the Can Grow (Common tab/Format Editor) option. In this case, if the program needs to grow the section to accommodate field output, it will grow the line to the bottom of the section as well.