As an administrator, you can turn on Email Meter’s access for a specific group of users rather than the entire domain or an organizational unit. This lets you control access for specific users without changing your organizational structure.
You might not have permission to do these steps. Make sure you’re signed in to an administrator account on your Google Workspace domain.

During the installation

During the installation of Email Meter Enterprise via the Google Workspace Marketplace, you’re presented with a choice: install the application for the entire domain or limit it to selected users via Access Groups. Choose “Certain groups or organizational units” and it will take you to a screen where you can specify the groups that Email Meter will have access to.

After installation

From your Google Workspace Admin Console, go to Apps > Google Workspace Marketplace apps. Select Email Meter Enterprise. Under the User Access section, you’ll find the option to “View organizational units and groups”. Here, you can deactivate the app for all users and then selectively activate it for designated Access Groups, ensuring precise control over who can utilize Email Meter within your organization.
No, it’s not necessary to grant access to all users who access Email Meter. Email Meter requires access only to the mailboxes that are being tracked: this means that only the accounts for which you want to generate email statistics need to be granted access.
While you can technically do it, we don’t recommend to rely on OUs to restrict Email Meter’s access. The advantage of using Access Groups is that users can be included in multiple Access Groups, while they can only belong to one Organizational Unit (which are often used for other purposes). By using a specific Access Group to manage access to Email Meter, you can make sure that users’ access isn’t accidentally revoked.
Email Meter will lose access to the account and will no longer be able to gather email statistics from it.
Follow the steps on Google’s official documentation here.