Thanks for joining this conversation, @mikaelxix.

Since QuickBooks Online (QBO) doesn't have a template for Payment Voucher, you can use the Standard template instead. The design of this template will affect how your Payment Voucher looks like. Please note that this is only available in the Essentials and Plus versions of QBO.

If you're using one of these versions and the Standard template is not showing, try signing into your QBO using a private browser (incognito). There are times that the browser is already full of frequently accessed page resources, causing some unusual responses.

Here's how:

• Press Ctrl + Shift + N (Google Chrome).
• Ctrl + Shift + P (Firefox).
• Control + Option + P (Safari).

Once logged in, go back to the Custom Form Styles page and start editing the standard template.

If everything looks good, return to your default browser and perform a clear cache to refresh the system. However, if the issue persists, try using other supported browsers.

To learn more about personalising your templates in QBO, consider checking out this article for further guidance: Customise invoices, estimates, and sales receipts in QuickBooks Online.

Reach out to me in the comment below if you have any additional questions or concerns. I'm always here to help. Have a good one!