In a Word document, or in an email message you are writing, you can draw lines (and other shapes) to illustrate what you're saying.
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On the ribbon, select Insert > Shapes.
(In Outlook, if you don't see the Insert tab, you're likely using the reading pane. Select Pop Out at the top of the message to open a standalone window that includes the Insert tab.)
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From the Lines gallery, select the kind of line you want to draw.
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On the canvas, click and drag your mouse to draw the line.
Tip: To draw a perfectly horizontal or vertical line, press and hold the Shift key while you draw.
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With the line still selected, on the ribbon, on the Shape Format tab, select Shape Outline. From that menu, you can choose a color, a weight (line thickness), and line styling (such as dashes or arrowheads).