The illustration shows two model documentation drawing views, a base view and a detail view, which have been selected by clicking them.
Why is it important to know where the drawing view border is? If you want to select the drawing view, click an empty area inside the drawing border. Consider the detail view in the illustration. It contains a circular detail view border that extends beyond the drawing view border. If you click inside the detail view border, the drawing view is not selected unless the point you clicked is inside the drawing view border.
By default, orthogonal drawing views are constrained to be aligned to their parent views. If you move a parent view, the child view also moves to maintain alignment. If you move a child view, the direction of movement is restricted to maintain alignment. You can toggle the alignment constraint by tapping the SHIFT key as you move the child view.