Hello, AdminE.

I can walk you through the steps of how to turn off the auto email reminders to customers option in your QuickBooks Online (QBO) account. Don't worry. It only takes a few easy steps. 

Here's how:

1. Go to the Gear icon.
2. Under Your Company, select Account and settings.
3. Click the Sales tab.
4. Select the Reminders edit pencil icon.
5. Click the Automatic invoice reminders to off.
6. Select Save and then Done.

If you're using QuickBooks Online Advanced, we can go to your Workflows to disable this payment-due reminder. Here's how: 

1. Go to the Gear icon (⚙) and then select Manage workflows.
2. Proceed to the My Workflows tab.
3. Click the Edit drop-down under the Actions column of the Payment due reminder that you're trying to disable.
4. Select Disable.

Meanwhile, I'm adding these articles to learn more about setting up auto-reminders for overdue invoices using QBO Advanced, Plus, Essentials, and Simple Start plans.

• Send invoice reminders automatically or manually in QuickBooks Online.
• Use workflows in QuickBooks Online Advanced to send reminders.

Let me know how else I can help you with navigating QuickBooks Online by adding a comment below. I'm more than happy to lend a helping hand. Keep safe.