Headings allow users to easily navigate your document and find the information they need. You should try to have a heading or title on each slide.
The Document Does Not Have Any Headings
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For Microsoft Office 365 users, ensure that you are using a layout that allows you to add a title. Avoid layouts such as the blank layout, as it prevents you from adding titles or headings.
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Right-click a slide and navigate to Layout in the context menu. From there, select Title Slide.