This function affects the way that you resize a frame with the mouse. When you click on this icon, it will appear selected. If there was a frame selected in the layout window, the resize handles in the middle of the boundary lines will disappear and will only remain in the four corners. As long as this function is active, if you resize the frame with the mouse it will keep its original proportion of height to width, no matter how small or large you make it. This is of particular interest for graphics and other images, because no distortion will result when enlarging or shrinking the frame. To turn off this function, click on the relevant icon a second time.
Warning: This function has no effect on size changes made with the Coordinate display.
