A vertical alignment option by which space is automatically added between lines to fill up the entire vertical space between the top and bottom margins

The vertical alignment option you're referring to is called "Justify". This option adjusts the spacing between words so that each line fills the entire width between the left and right margins, giving your document a clean, aligned look. Here's how you can do it:

1. Open your document in the word processing software you're using (like Microsoft Word or Google Docs).
2. Highlight the text you want to justify.
3. Look for the "Paragraph" settings in your toolbar. This is usually located at the top of your screen.
4. Within the "Paragraph" settings, look for the "Alignment" options.
5. Click on "Justify". This will adjust the spacing of your highlighted text so that it fills the entire width between your margins.

Remember, justifying text can sometimes create large gaps between words if your sentence is short, so it's best used with longer sentences.