When collaborating with others, or having to format a document in Microsoft Word. We like to leave two functions permanently enabled. The ruler which is an obvious visual aid that will help with positioning various objects on a page. And formatting marks, which while a little controversial in that they can make a document look cluttered and difficult to read. Are very handy when trying to troubleshoot the formatting in a document.
Note: When the ruler and formatting marks are enabled in MS Word. These functions will remain on, even if you open a new document or close and reopen Word.