How is the state 'employee' of a person defined? The default visibility for projects is "employees only", but everyone seems to be a employee. So employee = ERP user. It doesn't help to delete the user from Human Resources.

The original problem is that we have external ERP users which shouldn't see some projects. Of course they have an ERP account, but they're not listed under HR.

So we have to use the filter "followers only" because this works. "Employees only" has no effect.