Transcription: Select a line or curve and using the right mouse button, click on the Line Style button in the button bar to display the arrowhead dialog box. Specify the style and size of the beginning and ending arrowheads and click on Apply. In addition to arrowheads, there are a dozen other symbols you can select for the beginning or end of a line. Once an arrowhead has been applied to a line style, it will appear in the Line Style button. To turn off the arrowheads, select the first entry in the list, a line signifying no arrowhead, and click on Apply.
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