Remove Personal Information when sharing Office documents

Microsoft Office by default documents stores your personal information when creating or editing an office document. You can remove that information like comments, version history, and metadata containing personal information like document author, and date of creation, before sharing the file with other people externally. The Document Inspector feature in Word, Excel, PowerPoint, or Visio can help you find and remove hidden data and personal information in documents that you plan to share.

For Windows

1. In an open Word document, click File then Info.
2. Select Check for Issues and choose Inspect Document to control what type of content you want to be flagged.
3. To start your search, click Inspect and then Remove all the information you want to be edited from your content.

Repeat the process by clicking the Reinspect and Remove all buttons until your document is clean. Click the Close button to save your changes

Reference: Remove hidden data and personal information by inspecting documents, presentations, or workbooks