Hi,
Thank you for posting in Microsoft Q&A forum.
1,We can use Intune configuration policy to hide the "Try the new Outlook" toggle . Go to Configuration Profiles -> Create profile -> Windows 10 -> Administrative Templates -> User Configuration ->Hide the “Try the new Outlook” toggle in Outlook . As shown below.
Hide New Outlook Toggle in Outlook Desktop App using Intune
2,We can also use the registry to disable the New Outlook toggle in Outlook Desktop and deploy below registry to the Windows devices.
This value hides the Try the new Outlook" toggle in Outlook Desktop:
[HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\General]
"HideNewOutlookToggle"=dword:00000001
Enable or disable employee access to the new Outlook for Windows
Thanks for your time. Have a nice day!
Best regards,
Simon
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