When Sync settings is turned on, Windows syncs the settings you choose across all your Windows 10 devices that you've signed in to with your Microsoft account.
You can also sync your settings for a work or school account if it’s allowed by your organization. For more info about how Azure Active Directory and Enterprise State Roaming work to synchronize user and app settings to the cloud, see Enterprise State Roaming overview.
To find Sync settings, select the Start button, then select Settings > Accounts > Sync your settings .
To stop syncing your settings and remove them from the cloud, turn off synced settings on all the devices connected to your Microsoft account, and then go to the Devices page, select More actions for the device you want to manage, and then select Remove cloud backup of personal settings.
Choose from settings such as language preferences, passwords, and color themes. If you turn on Other Windows settings, Windows also syncs some device settings (for things like printers and mouse options), File Explorer settings, and notification preferences. For a complete list of settings that Windows can sync, see Windows 10 roaming settings reference.