Maple provides four styles for curves: Line, Point, Polygon, and Polygon with outline.

Line style displays a curve as a solid line and any polygons as outlines.

Point style displays any curves as a series of points created with symbols and any polygons by drawing symbols at their vertices. The plot of a curve will consist of the sample points only. Control the symbols and symbol size.

Polygon with outline style displays any polygons in the plot as polygons with a black outline.  Lines and points are drawn in the normal way.

Polygon style displays any polygons in the plot as polygons without an outline.  Lines and points are drawn in the normal way.

Click the plot to select it. Alternatively, right-click on the plot.

From the Plot menu, select Style.

Select the desired style.

Note: For standard plots, you can also use the style option in the plot command.