This policy setting controls whether the option for Office Insider is shown under File > Account in an Office app, such as Word.
By showing this option, a user can choose to join or leave the Office Insider program. For more information about the Office Insider program, see https://insider.office.com.
If you enable this policy setting, the option for Office Insider is shown under File > Account.
Note: if you enable this policy setting, you shouldn't enable and configure the "Update Channel" or the "Update Path" policy setting under Computer Configuration\Policies\Administrative Templates\Microsoft Office 2016 (Machine)\Updates. If you do, those policy settings will take precedence, even though the option for Office Insider is shown.
If you disable this policy setting, the option for Office Insider is not shown under File > Account.
Note: This policy setting only applies to subscription versions of Office, such as Microsoft 365 Apps for enterprise, and to subscription versions of Project and Visio.