Cascade
Use this function to position multiple open windows in a cascade effect. When you arrange document windows in this manner, you can quickly select the part you want to view. When multiple parts are cascaded, the part you select appears on top of the others.
Using the Function:
Click Windows>Cascade. Any window currently open is arranged in a cascade effect, as shown in the example below. To view a hidden part, click anywhere on that part and it will appear in the foreground.
Above > An example of three open parts arranged using Window>Cascade