Hi there, @atoth.
You can see all your invoice templates in the Custom form styles. See the steps below to find this.
- Go to the Gear icon.
- Select Custom Form Styles under Your Company.
- Click the tab to view your invoice template.
If you are referring to the transaction page of the invoice, please see the steps below.
- Click the Plus icon.
- Select Invoice under Customer.
- Click the Customize at the bottom.
- Then, select the option provided to see your template.
You might want to visit this article about uploading invoice template to QuickBooks.
Reply to this thread anytime for further concerns. Have a good one.