Fill
Places a fill inside a closed boundary. You can place a fill only inside a closed boundary. If the software cannot determine the fill boundary due to the complexity of the geometry, the fill color will be gray to indicate that the fill was improperly done. Also, if the software determines that the fill boundary is not closed, the feedback is a beep and no fill.
You can modify fill properties using the Fill ribbon.
In SmartSketch, you can also access this command on the Schematic toolbar.