Lattice Admins can configure Managers of Managers' permissions to view the review cycles their indirect reports are reviewed in. Managers of managers (or MOMs) are automatically set up in Lattice when you set up your org chart.
To view an unshared review as a Manager of a Manager:
Navigate to Reporting > Reviews.
Find the desired review cycle and click View progress.
Click on the employee you would like to view.
The right-side context panel will open. Click View current review packet.