You can alter the margin of a single paragraph by placing your cursor anywhere within that paragraph.
You'll see left and right tab stops in the ruler; slide these stops to the margin you want and the paragraph will change with it. Ninety-nine percent of the time you'll want to use the right tab stop.
In this example, the right tab stop has been dragged a couple of ticks to the right in order to pull the word "treasure" onto the first line.
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