Hello there, @suzannek1.

The option to disable the shipping information in the Customer section is unavailable in QuickBooks Online (QBO). However, you have the option to remove the shipping information from the invoice. Let me walk you through the steps for a seamless process:
 

1. In your QBO account, go to the Gear icon, then select Accounts and settings.
2. Navigate to the Sales tab, then turn off the Shipping in the Sales Form Content section. 
   
   
    
3. Once ready, click on Save, then Done

You can also check on your Custom Forms Styles section and make sure that the Shipping box is unchecked.  Here's how:
 

1. Go to the Gear icon, then click on Custom Forms Styles.
2. Select a template and click on the Content tab.
3. Click on the upper section of the template.
4. Under the Display portion, make sure that the Shipping box is unchecked.

Additionally, you might want to explore this article that provides guidance on how to apply discounts to invoices and sales receipts: Add a discount to an invoice or sales receipt in QuickBooks Online.
 

Whenever you require assistance in managing your sales forms in QuickBooks, I'm just a comment away. Rest assured, I'll respond promptly and offer the help you need.