Anyone with the appropriate permissions can see evaluations, so it depends on what permissions your managers have. To see evaluations, you need the Quality > Evaluation > View permission.

If your managers have the Genesys Cloud supervisor role with default permissions, they can view evaluations through the Agents Evaluation Summary or Agents Evaluation Detail views. 

To see those views, users need the following permissions:

• UI > Supervisor Agent Details – View
• Directory > User – View
• Quality > Evaluation  – View

By default, the Genesys Cloud Supervisor role includes the first two permissions. You can either add the last permission to the Genesys Cloud Supervisor role or create a new role with that permission and add all of your managers to that role. For more information, see Quality management roles and permissions.