Final answer:
Ruby can use the Page Setup command to change the size of the margins in her document.
Step-by-step explanation:
Ruby can change the size of the margins in her document by using the Page Setup command in her word processing software. This command allows her to adjust various aspects of the page layout, including the margins. By selecting the Page Setup option, Ruby will be able to specify the desired size for the margins, such as setting them to be wider or narrower.
Learn more about changing margin size in a document