When teaching Styles in Microsoft Word recently, we were doing an exercise to use Heading 1, Heading 2 and Heading 3 styles. However, on some of the training computers, Heading 3 was not visible on the Styles Gallery in the Styles group on the Home tab.
To add any built-in style to the Styles Gallery, provided you are using Microsoft Word 2007 or Microsoft Word 2010, click on the little arrow at the bottom right of the Styles group to open up the Styles window. At the bottom, you will see three buttons:
Click on the third of these buttons, which will open the Manage Styles dialog box. Click on the Recommend tab.
In the list, select the styles that you want in your gallery that are not presently visible. Click the Show button, then click OK. The required styles will be added to your Styles Gallery.
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