Disable Preview Place.

This policy setting determines whether the Preview Place feature is allowed. Enabling this setting will block the Preview Place feature from being available.
Users will no longer be able to preview and provide feedback on upcoming changes in Outlook.
Note: This policy setting only applies to subscription versions of Office, such as Microsoft 365 Apps for enterprise.

Supported on: At least Windows 7

Registry Hive	HKEY_CURRENT_USER
Registry Path	software\policies\microsoft\office\16.0\outlook\options\general
Value Name	disablesupportbackstage
Value Type	REG_DWORD
Enabled Value	1
Disabled Value	0

outlk16.admx

Administrative Templates (Computers)

Microsoft Office 2016 (Machine)
Microsoft PowerPoint 2016 (Machine)
- Converters
  - Turn on an external converter as the default for a file extension
Skype for Business 2016
- Microsoft Lync Feature Policies

Administrative Templates (Users)

Microsoft Access 2016
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- Customizable Error Messages
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  - Custom
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- Miscellaneous
- Tools | Security
  - Workgroup Administrator...
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  - Modal Trust Decision Only
Microsoft Excel 2016
Microsoft Office 2016
Microsoft OneNote 2016
- OneNote Options
Microsoft Outlook 2016
Microsoft PowerPoint 2016
Microsoft Project 2016
- Miscellaneous
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Microsoft Publisher 2016
Microsoft Teams
- Prevent Microsoft Teams from starting automatically after installation
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Microsoft Visio 2016
- Customizable Error Messages
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  - Predefined
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- Miscellaneous
- Visio Options
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Microsoft Word 2016
Skype for Business 2016
- Microsoft Lync Feature Policies