You can control this in just two ways: (1) For a specific project, for a specific user. (2) For all projects, for all users.
FOR A SPECIFIC PROJECT:
1. From the Project, click the EDIT from within the Manage (3 dot) Menu:
2. Find the Project Manager in the list of Followers and Edit their subscription:
3. Choose what they will follow:
FOR ALL PROJECTS:
1. Activate Developer Mode. Navigate to Settings --> Technical --> Email --> Subtypes.
2. Filter for the Project model:
3. Open and Edit the DEFAULT boolean on each as needed:
4. Filter again for "Model is not Set" if you want to change the defaults on ALL Models (not just Projects):
Consider that Projects can be DUPLICATED (from the same EDIT menu - after saving - access Duplicate from the Action Menu) , and you can therefore use Projects as 'templates' for other Projects.
I have this same question. Is there anyone out there that can explain how to set a user (project manager) to follow all items?