The two radio-buttons shown above sets how the items will be displayed on the canvas.
Shapes drawn in outline-style look like these :
The series of radiobuttons above show the different colours available for each shape. Only one button can be selected at any time, but all can be used in either of the style modes (Fill or Outline).
If you are unsure as to the exact colour of each option, the shape can be created and the colour value amended at any time.
The shape is drawn with the line-width of the selected value (currently set at the default value of 4) if the fill-style option is "Outline".
A few examples of the same item drawn with different line-widths is shown below, with the corresponding line-width :
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Gudge.