Changing Fonts 
The Font tool specifies the font, font style, and size of text comments.
To specify the font:
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On the Markup tab in the Options dialog box, click Font
.
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Specify:
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Font.
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Font Style. Select Regular, Italic, Bold, or Bold Italic.
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Size. The SolidWorks eDrawings Viewer calculates a default based on model size, which you override by setting this size.
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Sample. Displays several characters in the selected font.
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Script. Some fonts include a choice of alphabet.
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Click OK.
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Select one of the Apply changes to options and click OK again.