As you move the mouse cursor around the section preview, its position is reflected in the plan of the model from which the section was taken. On a black background, a small magenta filled square is displayed at the position on cut line of the mouse cursor in the preview window. As you move the cursor left or right in the preview window, the square will move along the section cut line. The square will be green on a white background, as shown below. Unfortunately, when taking screen grabs, Windows ignores the mouse cursor and so it is not displayed.