Word doesn’t actually change the page margin randomly. Instead, the appearance of the right margin (where text lines end) shifts due to formatting applied to paragraphs, sections, or objects within ...
Whether you've worked with Microsoft Word for years, or have just begun mastering it, you may leave many of its preferences set to their defaults, rather than figure out how or whether to change them.
The Print Layout View is the Default View. It allows the user to see how the document would look if printed. This View is handy for creating headings and moving a whole paragraph within a document.
Whether to improve your document's aesthetic appeal, allow more space for handwritten annotations, or squeeze all your text onto one page, there are many reasons to adjust a Word document's margins.