This tutorial covers the Line Style options on the Format Shape/Format Picture window. These options control the appearance of lines, arrows, and object outlines. (See this tutorial for ways to access the formatting window.)
Enter the number of pixels or use the arrows to increase/decrease the line width.
If you'd prefer to use multiple outlines, choose a style from the drop-down.
To create a dashed line, choose a style from the drop-down.
Choose a style for line endings. Flat means no caps are added to lines. Square and Round each add a cap shape. For example, here are three lines of identical length, each with a different cap type.
Choose how lines should look when they intersect: rounded, beveled, or mitered. For example, here’s what each join style looks like on the corners of a square.
To add arrows to the ends of a line, choose a style from the Begin type and End type drop-downs, then select a size from the Begin size and End size drop-downs.