Open the Google Docs file
Click File
Click Version history
Click See version history
Use the right sidebar to view past edits
Click a dated version to open it
Review changes made in that version
Click the arrows next to a version to expand more details
Use keyboard shortcut Ctrl+Alt+Shift+H on Windows or Cmd+Option+Shift+H on Mac
Click a collaborator name in the version history to filter their edits
Restore a previous version if needed by clicking Restore this version