Modifying a line style
In a diagram, you can modify the style of each line.
You can also modify the style of several lines at once.
For each line, you can modify:
its style:
free or orthogonal
closed: enables to draw an irregular polygon, which can be filled with a color or a pattern.
perspective: enables to adjust the right angle in diagram with object in perspective.
its appearance:
curved or straight
rounded or right angles
simple or double
weight
dashed or solid
its color
its extremities:
line ends covered or not by connected elements
with or without shapes
(with shape) each shape color
To modify a line:
1. Select the line.
*To modify several lines at once, use the [Ctrl] key to select the lines.
2. Open the Aspect page.
3. In the Colors section, use the Border drop-down list to modify the color of the line:
4. (If needed) In the Shadows and Position sections, you can:
add shadow
send the line to the back
5. In the Lines section, use the drop-down lists to modify the line:
its Style and Thickness
its Extremities
(If needed) Select:
Curved line
Double line
Rounded Angle
Examples of lines 
Orthogonal line, rounded angles
Perspective line, rounded angles, start style: empty diamond, end style: circle filled with orange