QuickBooks Sync Manager lets you sync your company files with third-party apps. However, syncing the files with a third-party app may bring errors due to which you may need to turn off the sync manager service. To find out how to disable QuickBooks Sync Manager, carry out these instructions:
From the Windows Taskbar, locate the Intuit Sync Manager service.
Click right on the sync manager to view the syncing company files.
Select the Sync Enabled button.
Choose the Disable button using the drop-down arrow.
To clear the Sync settings, you can press the Help menu.