Viewing history

You can view the entire history of the Project and any changes made.

To view the Collaboration history:

On the Unity Editor toolbar, click the Collab button.
To open the Collab History window, click the History button (shown below), or select Window > Collab History.

In the Collab History window, you can restore previous versions of your Project. For more information, see Restoring previous versions of a Project.

Adding team members to your Unity Project

Enabling Cloud Build with Collaborate

Unity Manual