Communication from co-host

[Marin6]

Hi,

I'm the listing admin and my sister is a primary co-host.

So far, all communication for the property hosting by my sister (primary co-host) were sent only to her SMS and App notificactions.
From a week ago, I started getting all messages (reservations, messages from guests as well the messages sent to the guests) too.

Does anyone know how to change the settings in order to stop receiving messages from the primary co-host?

Thanks,

Marin