Stroke joins

For paths that contain sharp corners (like triangles or rectangles), you can change the way the stroke looks at each corner point by selecting from among three stroke joins. To change the stroke join:

1. Select one or more paths on your page.
2. Click the Show advanced properties button  at the bottom of the Appearance category of the Properties panel.
3. Choose from the options in the Joint drop-down list: Miter join (which creates sharp corners), Round join, or Bevel join.

Stroke Joins: miter (left), round (center), and bevel (right)

Note that when a corner is too sharp (too small of an angle), the mitered point would extend too far from the path. In this case, Expression Design automatically converts that corner to a bevel join.

These joins affect only the outside of any corner point. That is, the inside of the stroke at the corner point is always a sharp point. Stroke joins do not affect curved points on a path, but they work on any type of stroke (basic strokes or brush strokes) and both Bezier and B-spline paths.