Use the following command to disable the annoying "Focused Inbox" setting across your entire tenant. It is possible to disable it on a per user basis, but do the right thing and remove it for everyone!
$UserCredential = Get-Credential
Install-Module MSOnline -Force
Import-Module MSOnline
$Session = New-PSSession -ConfigurationName Microsoft.Exchange
-ConnectionUri https://outlook.office365.com/powershell-liveid/
-Credential $UserCredential
-Authentication Basic
-AllowRedirection
Import-PSSession $Session
Set-OrganizationConfig -FocusedInboxOn $false
Get-OrganizationConfig //Check to see FocusedInbox is set to “false”
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