Manage Office 365 Exchange Online in Multi-dom

Good morning,

I request your support regarding an environment found on a client. The customer has a number of Active Directory domains in two-way trust with each other. Exchange 2016 was installed on the domain of the parent company in hybrid mode with office365 and with ADConnect in password-hash mode. From the exchange 2016 interface I can manage all the objects exclusively of that domain, how can I manage the other users present in the trust domains? Do I need to install an Exchange 2016 for each domain connected to 365? I thank