View Or Change The Properties For An Office File - Microsoft Support

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Click the File tab again to return to your document. Any changes you made are saved automatically.

Optional steps:

To see more properties, click the Show All Properties link at the bottom of the page.
To open a properties dialog box where you can add or edit all the properties at once and view document information and statistics, click Properties at the top of the page, and then click Advanced Properties.

On the Summary tab, you can add or edit the Title, Subject, Author, Manager, Company, Category, Keywords (also called Tags), and Comments.