Just as fashion styles change, you may need to change styles in your Word 2013 document. Nothing is wrong with that. In fact, by changing a style, you demonstrate the power of Word: Changing a style once causes all text formatted with that style to be updated. It beats the pants off making that change manually.
To modify a style, heed these steps:
Summon the Styles task pane.
Keyboard shortcut: Press Ctrl+Shift+Alt+S.
Point the mouse at the style you want to change.
A menu button appears on the right end of the style’s entry.
Click the menu button to display the style’s menu.
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The style’s menu will appear.
Choose Modify.
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The Modify Style dialog box appears, although it’s the same Create New Style from Formatting dialog box.
Change the formatting for your style.
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Use the Format button to alter specific styles: font, paragraph, tabs, and so on. You can even add new formatting options or assign a shortcut key.
Click OK when you’re done.

Close the task pane if you’re done with it.