How to change invoice colour?

I can help you change the invoice color, Fares.

If you wish to change the color of the invoice page, please know that this is currently unavailable. However, we can change your invoice template by following these steps:

1. Go to the Gear icon and select Custom Form Styles.
2. Select the form if you already have one, then Edit or click New Style and choose Invoice to customize.
3. Click the Design tab, and select Try other colors.
4. Choose the color you want and click Done.

To learn more about this, check this article for information: Customise invoices, estimates, and sales receipts in QuickBooks Online.

Additionally, you can read this article to learn how to create and send the same invoice to multiple customers in QBO Plus and Essentials: Create the same invoice for multiple customers.

You can add replies to this thread for additional questions about managing invoices in QBO. I'm always here to help.