How to HIDE the “Try the new Outlook” toggle displayed in Outlook:

1. Registry File:

Windows Registry Editor Version 5.00[HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\General]“HideNewOutlookToggle”=dword:00000001

1. Office Group Policy (Administrative Template files must be downloaded and installed):

User Configuration > Administrative Templates > Microsoft Outlook 2016 > Outlook Options > Other: Hide the “Try the new Outlook” toggle in Outlook