Fields and portals can be set to shrink but not to expand. You either have to resize them out to a maximum size and then set them to shrink or find a different way to display your data. Field and Portal shrinking are only visible in preview mode or when you print the layout.
On the other hand, if you click into a field that has more data than it can display, it will pop out to display all the field's contents if the field's settings permit you to enter the field.
I knew about the sliding up. I didn't think you could expand portal rows, just wanted to ask in case the world wasn't actually flat.
And yes, I was referring to printing a layout with a portal row.