Once you've drawn an annotation line you can add an arrowhead to either end of the line (see the line extending from "Proposed Pipeline Extension" in this figure and the one extending from "Groundwater level" in this figure).
To add an arrowhead to an annotation line:
- Draw the line.
- Choose Annotate > Add Arrowhead.
- Move the mouse pointer so that it is directly over the end of the line that is to receive the arrowhead.
- Click the left mouse button.
To remove an arrowhead from an annotation line:
- Simply repeat the procedure for adding an arrowhead: Selecting Annotate > Add Arrowhead and clicking the left mouse button over a line endpoint that already has an arrowhead will remove the arrowhead.