Styles give your document a consistent, professional look.
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Select the text you want to format.
Tip: If you place your cursor in a paragraph, the style is applied to the whole paragraph. If you select specific text, only the selected text is formatted.
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On the Home tab, point to a style to preview how the text will look with that style.
Tip: If you don't see the style you want, click the More button
to expand the gallery. -
Select a style.
Source: Microsoft