Thanks for taking the time to post your concern in the Community, Miguel. I'm here to explain the price unit on billing forms in QuickBooks Online (QBO).
Before that, to provide the most accurate and relevant solution, could you share the billing forms you currently use to view your price per unit? Additionally, when you mention "price unit," are you referring to the price rate? Your detailed feedback will help us tailor our response to meet your needs precisely.
Furthermore, let's navigate to the Custom Form Styles and ensure the Rate option is checked to view the Price Rate per item. This adjustment will enable you to see the prices of your items clearly on your forms. You can follow the steps below:
1. Log into your QBO account.
2. Go to the Gear Icon, then select Custom Form Styles under Your Company.
3. Click on the Content tab, then the Table section.
4. Put a checkmark on the box beside Rate.
5. Once finished, click Done.

After performing this step, you can see the price rate of your item.

Refer to this article to learn more about personalizing sales forms in QBO: Customize invoices, estimates, and sales receipts in QuickBooks Online.
Moreover, allow me to share these resources about generating QBO reports to gain valuable insights into your financial business:
Drop me a comment below if you have additional questions about sales forms in QBO, Miguel. I'll be sure to help you out. Have a great day ahead.