Hi there, Seth. I understand that this situation has caused disruption to your workflow in QuickBooks Online (QBO). I'd like to share options that will help fix the issue that you're experiencing when using your invoice.  

There is a chance that you are already encountering the new invoice experience. The new invoice experience in QuickBooks Online (QBO) refers to an updated interface and enhanced features for creating and managing invoices. It may include improvements such as a refreshed design, streamlined workflows, additional customization options, and enhanced functionality to make the invoicing process more efficient and user-friendly. 

To go back to the old layout of your invoice, I've got some steps here that you can follow: 

1. Go to +New. 
2. Select Invoice. 
3. At the top right of the form, select Old layout.

Refer to this article for more information about the feature: See what’s new with estimates and invoices in QuickBooks Online.

If the same thing happens, let's try signing in to your QuickBooks Online (QBO) account using a private or incognito window. This mode doesn't use the existing cache data and helps us confirm browser-related issues.

Here's how:

• For Google Chrome browser: Ctrl + Shift + N
• For Mozilla Firefox browser: Ctrl + Shift + P
• For Safari browser: Command + Option + P

If it works, go back to your regular browser and clear the cache to delete those temporarily stored files and browsing history. The overtime collection of data can create corruption, however, removing this should fix the issue. You can also use other supported, up-to-date browsers to roll out the possibility of a browser-related issue.

Refer to this article for more information about the feature: See what’s new with estimates and invoices in QuickBooks Online.

Lastly, you may also get in touch with the Customer Care Team for further assistance if the issue persists.

Here's how to reach them:

1. Click the (?) Help icon in the upper right-hand corner of the Dashboard.
2. Select Talk to a Human.
3. Enter a short description of your concern and press Enter.
4. Click I still need a human.
5. Select Contact Us to connect with our live support.
6. Choose Get a callback.

Our representatives are available from 6:00 AM to 6:00 PM on weekdays and 6:00 AM - 3:00 PM on Saturdays, PT. For more information, check out our support hours and types.

I'm also adding this link in case you need help managing customer-related tasks. It has our general customer topics with articles, some videos, and topics about your company's income and customers: Sales and customers.

I'd like to know how you get on after trying the steps, as I want to ensure this is resolved for you. Feel free to reply to this post, and I'll get back to you. Take care always.