You can create a separate paragraph style for the paragraphs you want to format differently. In the style, simply set the indent before text and indent after text, if required, to a suitable value.
Or you an use the direct format method (not recommended) of Format | Paragraph. The use of styles is preferred; if for example you have used this format widely throughout your document and then decide the indent(s) need to be a different size, you simply edit the style once and all paragraphs of that style will be changed. With direct formatting you would need to change each paragraph separately.
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