It's probably the most requested and most frustrating thing about portals. My QB 2002 expands as you enter data and add on to line items, but not in FileMaker.
The only way to see it the way you want is to make the fields bigger, and view in preview mode with sliding enabled. or recreate the look of the portal with a virtual list.
no, it's not possible in browse mode, not even in printing mode (you need a list layout with reducing body part, no portals but fields).