With Auto Grow turned on, the size of the loop (also Case Structure, Sequence, Event, etc) will increase as objects in it are moved beyond the border. If a new object is placed slightly over the border, the loop will also resize (larger). I find it desirable to turn auto grow on, as with it turned off, its possible to move objects out of sight, and they can become "lost". A front panel Tab control can also use this feature, but here you'd probably want to turn Auto Grow off, once you've arranged the controls/indicators on it.