A new GPO option in Windows 10 Creators Update allows administrators to turn on or off the ability for end users to sync their web site favorites between Internet Explorer and Microsoft Edge. This is particular useful for those companies that have not yet set Edge as the company standard due to incompatibility issues.
This can be set for the Computer or User context and is located at:
Administrative Templates\Windows Components\Microsoft Edge\Keep favorites in sync between Internet Explorer and Microsoft Edge
Note: This setting is only available for Windows 10 Creators Update (1703) or later.