Hi ibo001,
Welcome to Community! Having the ability to tidy up areas of your QuickBooks Online account is a great way to stay organized. However, the option to delete customers isn't currently available. I'd be happy to provide you with an alternative!
When a customer has been entered in error, you can make them inactive to remove them from the list. Here's how;
1. From the left menu, open Sales and then Customers
2. Locate and select the Customer in the list
3. Click on the ▼ dropdown beside the Edit button
4. Select Make Inactive
That's it!
Should you any other questions come to mind, please feel free to reach back out. We'd love to help!
