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What worked for me was setting cloudKitContainerOptions = nil before calling container.loadPersistentStores lazy var persistentContainer: NSPersistentContainer = { . . . if !UserDefaultsManager.shared.syncWithCloudKit { container.persistentStoreDescriptions.forEach { $0.cloudKitContainerOptions = nil } } container.loadPersistentStores( completionHandler: { (_, error) in ... } )This is a hack since this works only when persistentContainer is first initialized.Trying to do this after persistentContainer is initialized would require that I safely teardown and reinitialize the CoreDataStack. Reinitializing CoreDataStack creates a new managedObjectContext which then must be passed down the view hierarchy and to any services or managers that cache the managedObjectContext.There are many reasons to want to toggle or pause syncing with CloudKit, and since NSPersistentCloudKitContainer is privy to all the inner workings of syncing with CloudKit, NSPersistentCloudKitContainer should be the one to handle this. Some methods I could find useful would be: enum SyncMode { case disabled case paused // Paus temporarily, useful for batch processing case enabled } persistentContainer.setSyncMode( _ mode: SyncMode ) persistentContainer.syncAfter( someFutureTime ) // Sync after some time in the future.Steve