Microsoft SharePoint files are usually available to sync to a folder on your computer. In some cases, you may want to prevent people from using a sync app with a site or library.
To prevent the syncing all document libraries within a site:
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On the site, click Settings > Site Settings.
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Under Search, click Search and offline availability.
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In the Offline Client Availability section, select No.
To allow people to sync files again, set the Offline Client Availability option to Yes.
To prevent syncing of a specific document library:
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On the library, click Library Settings > Advanced Settings.
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In the Offline Client Availability section, select No.
To allow people to sync files again, set the Offline Client Availability option to Yes.
