If it's the space after the period at the end of the sentence, use
Edit>Replace to replace the period and a space with whatever you want
instead - either a period and two spaces if you want to increase it.
If it's the vertical spacing between paragraphs, user Format>Paragraph and
increase the space after the paragraph in the Format Paragraph dialog.
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Hope this helps.
Please reply to the newsgroup unless you wish to avail yourself of my
services on a paid consulting basis.
Doug Robbins - Word MVP