Here you may change the relative size of the atomic radii in the molecule. Upon selecting this item, you see two Carbon atoms attached by a gray line, a horizontal scroll bar and three buttons. When the two black circles touch, the radii are drawn in the Worksheet with no scaling factor. The relative size of the atomic radii can be increased or decreased by using the scroll bar. The Original button will draw the atoms with no scaling factor. The OK button performs the selected scaling on the atomic radii, and the Cancel button leaves the previous scaling intact.