Sorry, but you can't. They only shrink. This often requires setting up a layout dedicated to printing/previewing/saving as PDF that has such fields sized to an extreme size--a size impractical for data entry, but set to "slide up"/"resize enclosing part".
Thanks PhilModJunk - I was afraid that was still the answer... I was hoping in the newer versions this was no longer true... ah well -- so be it... !! :)