I can find lots of commentary on how to disable this service, but I only have one Windows device, so I'd like some documentation what exactly (not generally) this service is trying to do. No such documentation found, so far.
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Thank you for posting your query on Microsoft Community.
As per the issue description, I understand that you are willing to know what “SettingSyncHost.exe” do.
“SettingSyncHost.exe” is the process that synchronizes your system settings with your other devices so that changing your wallpaper/color on one computer changes all your other computers. It also syncs your Internet Explorer, mail app, OneDrive,
Xbox and other useful apps settings.
We have a dedicated forum support for systems on domain issues, I would suggest you to post your query on Microsoft TechNet forum for this issue. There you can get more effective and appropriate
suggestions by experts familiar with this topic.