I've found that when you insert a new diagram using the and de-select the "show diagram objects in table" then the diagrams always are minimised and every time a user as to use the zoom buttons. However, if you leave the diagram objects on, then it auto fits the diagram. It looks bad and requires the user to to keep zooming every time they visit the page if you just want the diagrams only
Also, would it be possible have more control over what columns are shown by default?