Greetings martinsrepair,
I can share some details about the banking feature in QuickBooks Online (QBO).
Currently, we are unable to turn this feature off in QBO. In case you want to learn more about the banking feature, please check this article:
About bank feeds and downloaded transactions.
I've informed our Product Developers about your request. Please share your suggestion to them also. Your feedback helps us create a better experience for you and for all of our customers. Click on the Gear icon and select Feedback to send your input (see the screenshot below).
Thanks for your time. Reach out to me if you have other questions. Have a good one.