Meeting a submission requirement
When you're writing something with a required margin spec β an assignment, a paper, a contract β using the custom margins option lets you match the exact measurements requested rather than guessing at a preset.
Margins affect layout, not content
Narrower margins fit more content on each page, and wider margins push content onto more pages, but neither one deletes or alters the actual text β it's purely a layout change.
Frequently Asked Questions
Will changing margins cut off content I already wrote?
No. Narrower margins fit more onto a page and wider margins spread it across more pages, but the content itself isn't deleted or cut.
Can different pages have different margins?
Yes. Inserting a section break lets you split the document into sections and apply different margins to each one.