CmdID / PowerShell / Cmdlets / Set
Set-FocusedInbox
Use the Set-FocusedInbox cmdlet to enable or disable Focused Inbox for mailboxes in your organization. Exchange PowerShell reference
From the Exchange PowerShell reference 3 parameters Its page in the reference
Parameters
-IdentityThe Identity parameter specifies the mailbox that you want to modify.-FocusedInboxOnThe FocusedInboxOn parameter enables or disables Focused Inbox for the mailbox.-UseCustomRouting