How do I turn off Vendor Connect?

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If you're referring to your QuickBooks Business Network visibility, you can manage the setting from your Account and settings screen.
 

Here's how:
 

1. Use the Gear icon, then go to Account and settings.
2. Access your Advanced tab.
3. Click Business Network and hit Off.
4. Select Save, then Done.

After turning the accounts visibility to "Off", QuickBooks customers won't be able to find your business if they search the QuickBooks Business Network. You'll still be able to search for your customers and vendors, send invitations to connect, and use the AP Automation feature. Your connections made before turning off the visibility will still have your customer-facing contact details and can use AP Automation to send/receive invoices through the network.
 

QuickBooks is committed to protecting your privacy. For detailed information about how Intuit keeps data secure, visit our Privacy and Security Center.

I've also included a detailed resource about working with the QuickBooks Business Network which may come in handy moving forward: Learn about the QuickBooks Business Network
 

If there's any additional questions, I'm just a post away. Have a lovely Monday!