How do I remove our banking details from customer credit notes?

Hello Coates consulting, welcome to the Community. You would need to go to the default custom form and edit it. To do this, click on custom forms in the cog in the top right of QuickBooks>then edit on the default invoice>content and click on the bottom third and remove the footer text. The credit note does not have its own form, but it gets its content from the default invoice. -Emma