This tool can be used to cut a 5 mm segment out of a course leg, or a 15 degrees segment out of a control circle.

1. Click the Cut Segment button to select the tool
2. Select the course leg, or control, in question
3. Click the course leg, or control circle, where you want to cut out a segment

When you cut a segment of a course leg, two corner points are inserted, and the segment between the two corner points is "toggled" off.

A separate topic about How to manually cut a course leg line describes how you can cut a fixed length gap or a flexible length gap.