You can enable or disable data sync for a consumer profile from the Sync Settings tab.
To enable or disable data sync for a consumer profile
From the list of Consumers, click Manage Sync to manage data sync for the profile you want to enable or disable.
From the Sync Settings header, click Sync Enable toggle to enable or disable data sync. A message is displayed notifying you that the data sync is enabled or disabled.
When data sync is disabled for a consumer profile:
The Sync Now button is disabled.
Any in-progress sync is not affected and completes as normal.
Any scheduled synchronizations are cancelled (note that the sync frequency setting for this profile is still set in the event the sync is re-enabled).
The admin can still modify objects and fields for sync.