How do I turn off certain clients installing applications?

I have a few clients that I just do break/fix for and so I don’t care to get notified when any of their computers install/uninstall applications. How do I turn off those notifications for those clients, but leave it on for others?

You can create different policies for clients or groups.

Policies (with Policy Inheritance) – SyncroMSP

You can’t, application notifications are system wide.