Hello there, mmpoolmd.

The option to modify the default fields isn't available. However, I have a workaround that you may want to consider.

We can select as to how we want their name to display as. I'll show you how:

1. From the Sales tab, select Customers.
2. Select your customer.
3. Go to the Customer Details tab.
4. Click Edit.
5. In the Display name as field, select where it displays their last name.
6. Select Save.

I've also added these screenshots as your visual guide:

You can also take a look at these articles when creating an invoice and paying it online:

• Create invoices
• Send online invoices

I'm just around if there's anything else that I can help you with. Stay safe!

How are more people not asking this?  Wouldn't 99 percent of users have last name first for their customer list?  Who on earth sorts by a customer's first name?  This makes absolutely no sense.  And this is not a workaround - it's just the instructions on how to change each single customer.  Separately.  Every time you set up a new customer.  Mind-boggling.

I understand how important it is to work with features we're comfortable with, @DevotedDreamer. We're always working on delivering service that satisfies your preferences. 

The option to change the default Customer Display Name into a Last Name isn't available to QuickBooks Online (QBO). 

However, we would love to hear your ideas about them and recommend you send feedback. This way, our Product Development Team will know of your product suggestions and will help us enhance your experience with QBO.  

Here's how: 
 

1. Go to the Gear icon and select Feedback. 
2. Enter your product suggestion. 
3. Click Done. 

I'll also add a guide you can use to track your feature suggestion through Customer Feedback for the QuickBooks Online website. 

Additionally, feel free to read this article to learn about how to update or edit your customer's info: Add and manage customers in QuickBooks Online. 

If you have further concerns about QBO, please do let us know. We're one post away. Keep safe!