You can assign a fill color to polygons.
Procedure
Activate the Insert tab bar.
Click Polygon.
In the modeling area, click the position where you want the polygon to begin.
Click the position where you want the partial polygon to change direction.
Double-click the position where you want the polygon to end.
Double-click the polygon. The Graphic object properties dialog opens.
Select a fill color in the Representation area.
Click OK.
The polygon is filled with the selected color.