What does it do? You always receive a default display after you type in a set of equations. What if the default is not the size you want? For example, you might want to fill the screen with a single display, or to fill it with a dozen small displays. You need to be able to move your displays to another part of the screen, or to change their size.
How do I use it? To move a display, select the 'Move Plot' item from the Edit menu, or click the Move Plot button on the toolbar. The appearance of the cursor does not change, but it is now empowered to move display rectangles. Move the cursor to the display whose location you wish to change, and click the left mouse button. Holding the button down, drag the display where ever you desire. When you release the mouse button, the display will stick to its new location, even if it lies on top of (or underneath) another display. The order in which you originally drew the displays determines which one lies on top; the most recently drawn display rectangle always lies on top. If you want to move the display again, you will have to select the menu item or toolbar button again beforehand.
To change the size of a display, select the `Size Plot' item from the Edit menu, or click the Size Plot button on the toolbar. Click the left mouse button on the display whose size you wish to change, and hold it down as you drag the mouse. When you release the mouse button, the new size of the display rectangle will be fixed.