Get help with unsaved changes in Excel - Microsoft Support
Use the Unsaved Changes pane to show unsaved changes made to cell values and formulas.
Get notified when members of your team update your shared file ...
2019年4月4日 · If you share a slide deck in PowerPoint for Microsoft 365 or PowerPoint for the web, and other people make changes to the file, you'll be notified with a small banner that lets you know who has made changes to your presentation while you were away.
Restore a previous version of a file without unwanted changes
For a file stored in OneDrive or a SharePoint Online library, you can go back to an earlier version of the file and restore it. Open the file you want to restore and go to File > Info. If the file has previous versions, you'll see a button named Version History. Select it to see the list of versions.
Get help with Show Changes in Excel - Microsoft Support
For best results: Use any Excel app that supports co-authoring, changes include moving, sorting, inserting, deleting cells or ranges, and see Version History for changes past 60 days.
Collaborate on Excel workbooks at the same time with co-authoring
You and your colleagues can open and work on the same Excel workbook. This is called co-authoring. When you co-author, you can see each other's changes quickly—in a matter of seconds. And with certain versions of Excel, you'll see other people's selections in different colors.
Remove hidden data and personal information by inspecting …
Document Inspector helps you find and remove hidden data and personal information stored in documents that you plan to share. Here's how to use it. Tip: If you're just looking to print without comments, on the File tab select Print, choose Print All Pages, and clear Print Markup.
Show changes that were made in a workbook - Microsoft Support
Show Changes in Excel lets you see exactly what edits were made to your workbooks, so you can confidently allow others to collaborate on your work. You can see details of who changed what, where, and when, along with the previous value of the cell for quick reversion.
Restore a previous version of an item or file in SharePoint
Learn how to restore previous versions of items and documents in a SharePoint list or Library.
Recover an earlier version of an Office file - Microsoft Support
How you recover something depends on when you saved it. Open the file you were working on. Go to File > Info. Under Manage Workbook or Manage Presentation, select the file labeled (when I closed without saving). In the bar at the top of the file, select Restore to overwrite any previously saved versions.
Save a copy before editing to prevent changing the original file
These days with AutoSave, your changes are always being saved so you won't lose your work. To make sure you don't accidentally save changes in the original file, use Save a Copy BEFORE you start making your edits to ensure you're working on the new copy and not overwriting the original.
Restrict changes to files in Excel - Microsoft Support
You can use formatting and editing restrictions to prevent content reviewers from accidentally changing an Excel spreadsheet.