Drawing Order and Layers Various objects appearing on the screen may overlap one another just as if they were physical objects scattered on a table top. Unless it is transparent, the object on top will cover up the one under it. Every new object you draw is automatically placed on the top of all the previous ones. But you can change which objects are covered up and which are on top of the pile. Select the object whose 'drawing order' you want to change, then use the menus to send it either to the front or the back of the drawing order.
Layers take the concept of drawing order a step further.
Layers are like transparent sheets you can stack on top of one another. You can create as many layers as you want and move your object around from one layer to another. You can also change the order in which your layers are stacked, for example, move the layer on the bottom of the stack to the middle, or to the top. Besides managing drawing order, layers are very useful for organizing your drawing. Layers can be turned off when not in use, or set so that editing is allowed only on one layer at a time.