Thanks for joining this thread, @PinkSunset.

The steps provided by my colleague is a workaround so you can generate a report showing the transactions in the register without the REF NO. Please know that the option to customize the bank register to remove REF NO. is unavailable. To submit a feedback and product suggestions to our Product Development Team. You may refer to the steps outlined by my peer, ReyJohn_D.

To learn more about the latest product updates in QuickBooks Online, please visit our QuickBooks Blog. This page provides details for product recent improvements, news, and product enhancements. 

You can always get back here if you have other concerns or questions about bank registers in QBO. I'll be here to help you. Stay safe.