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How to hide the Sync button on a OneDrive Web site
In case you want to prevent users from syncing their OneDrive for Business Account, you can do so globally from the SharePoint Admin Center
OK, I am not even sure why I am writing this post since the feature I am describing in it is kind of useless, but I got a few questions about it, so I would like to document it once and for all. It is about the OneDrive sync button in SharePoint Admin Center.
Sync using OneDrive Client has proved to be one of the preferred methods for users to interact with the content stored in OneDrive for Business and SharePoint Online.
More about this Topic
Prevent users from installing the OneDrive sync app
The Sync button helps users install and set up the new OneDrive sync app
https://learn.microsoft.com/en-us/sharepoint/prevent-installation
Use OneDrive policies to control sync settings
This article describes the OneDrive Group Policy objects (GPOs) that admins can configure by using Group Policy or by using administrative templates in Microsoft Intune.
https://learn.microsoft.com/en-us/sharepoint/use-group-policy