How to Modify Document Properties in PowerPoint
File properties are bits of information that describe and identify a presentation, such as a title, author name, or tags.
To the right of the Info section, you can see the properties of the presentation. Some of the properties are updated automatically, like the file size and the created and modified dates, but you must update others manually.
Adding an Author is another property that's helpful to edit so you know who owns the file.
There are also some advanced properties you can edit that don't show up on the Info page.