There is not a way to hide object / resize the outer rectangle. There are work arounds for hiding fields, by setting the text size really large. Easies way is to have two layouts, one with three pictures and another with six, then go to the selected layout by checking if the forth, fifth, sixth container fields are empty.
Ok, thank you for your reply. Is it possible to, in List View, alternate between two different forms (one with six boxes, one with three) depending on the contents of those lower containers?