My customers are continuously receiving unpaid invoices in the inboxes. Is there a setting that I can turn off this automation, because they are getting annoyed by them?

I'd be glad to show you the settings where you can turn off this automation in QuickBooks Online, info1451.

You can turn off the invoice reminder through the Account and Settings page. Let me walk you through the process.

1. Click the Gear icon at the upper right corner and choose Account and Settings.
   
2. Select the Advanced in the left panel.
3. Go to the Reminders section.
4. Turn off the Reminder or set it to On due date.
   
5. Tap on Save.
6. Hit Done.

To help you utilize the reminder feature in QuickBooks Online, you can check out this article: Automate invoice reminders in QuickBooks Online. On the same link, you'll find tips on how to customize your email as well as sending them manually.

Additionally, you might find this article interesting: Create recurring transactions in QuickBooks Online. This will provide you details on how recurring transactions work in QuickBooks.

Kindly update me on the result as I want to make sure everything is taken care of for you. I'm also here if you need help with anything in QuickBooks. Have a good one!