From FreeCAD Documentation
- Select a view.
- Press the Add Leaderline to View button. A dialog will open allowing to draw the leaderline and assigning end symbols to the line.
- Click on Pick points and then click into the page to define the starting point of the line.
- Move the mouse and click on another point to create a line. Hold Ctrl-key to snap to multiples of 22.5° angles.
- Now you can either
- finish the line drawing by double-clicking or pressing Save Points.
- add further points to define more line segments.
- To finish the creation, press OK to close the dialog.