Hello plitz,

Thank you for dropping by here in the Community. Allow me to help share further information about the invoice fields in QuickBooks Desktop.

I understand the importance of having the fields you need on invoices depending on your preferences. While this is still unavailable, you can utilize the custom fields from the template customization as suggested by other users.

Here's how:

1. Click the Gear icon in the upper-right corner.
2. Below Your Company, select Custom Form Styles.
3. Choose a template.
4. Below the Action column, click Edit.
5. Go to the Content tab.
6. Click the pencil icon in the header part of the template.
7. Put a check mark on the fields you want to show.
8. Click +Custom field to add extra fields.
9. Click Done.

Additionally, to show the phone number on the invoice, please refer to the sample screenshot below:

For more insights into personalizing forms, I'm attaching the article I recommend:

Customize your invoices, estimates, and sales receipts in QuickBooks Online.

Please don't hesitate to come here with all of your needs, such as the invoices. The Community is here to ensure your success.