>moving it with the arrow bumps the structure boundary and just makes it larger
But that isn't what happens, in my experience. That's how the control became invisible. In fact, this is a bit insidious. I think it is easy to select items without knowing it, for example because shift-click is for dragging along orthagonal directions but also for adding to the selection. If I don't remember to click someplace empty, to deselect whatever might already be selected (which could have been before lunch and long forgotten), then shift-click-dragging something new actually moves both objects, leaving them selected, and then trying to arrow-key the thing I was trying to move is moving both of them, even if the earlier selection is off screen. When I move an object in a while loop with the arrow keys, and move it to the edge of the loop and keep going, it turns into a dotted outline graphically outside but logically inside the loop. When I deselect it, it becomes invisible. That was the underlying problem in the original post.
Isn't there some "autogrow structures" setting for this? I think I remember turning it off because I was tired of unintentionally rearranging all the things outside the structure to accomodate its growth. (LV isn't available at the moment)
