Before you share a presentation, especially with people outside your organization, remove any personal and confidential information stored in the document or in the document properties.
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Open the presentation file that you want to inspect for hidden data and personal information.
Tip: It’s a good idea to inspect a copy of your original document, because it’s not always possible to restore the data that the Document Inspector removes.
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Select File > Info.
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Select Check for Issues > Inspect Document.
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Select the types of content that you want to inspect, and then select Inspect.
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Review the results.
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For each type of content that you want to remove from the document, select Remove All.
Source: Microsoft