Showing content from https://support.google.com/docs/answer/190843 below:
Find what's changed in a file - Computer
Find what's changed in a file
You can see changes that have been made to a document in Google Docs, Sheets, Slides, or Vids.
- On your computer, open a document, spreadsheet, presentation, or video.
- At the top right, hover over Last edit to see who was the last person to update the file and when they last made changes.
Tip:
If there is a blue dot on the Last edit
icon, that means someone updated the file since you last viewed it.
Work with earlier versions of a file
Important:
View an earlier version
- On your computer, open a document, spreadsheet, presentation, or video.
- Choose an option:
- Choose the latest version. You can find who updated the file and their changes.
- (Optional) If you want to:
Restore an earlier version Copy an earlier version Create a named version See who changed a part of a document in Google Docs
Important: This feature is available to only Google Workspace Business Standard, Business Plus, Enterprise Standard, Enterprise Plus, and Education Plus customers.
- On your computer, open a document at docs.google.com.
- Select part of the document and right-click Show editors.
See who changed a specific cell in Google Sheets
- On your computer, open a spreadsheet at sheets.google.com.
- Right-click a cell Show edit history.
Tip: Some changes might not show up in the edit history. Some examples are:
- Added or deleted rows and columns
- Changes to the cell's format
- Changes made by formulas
Unable to see a previous version of your file?
The revisions for your file may occasionally be merged to save storage space.
Important: If you don't have permission to edit a file, you won't be able to see the version history.
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