Hi there, @PinkSunset.

Being able to remove the info in the transaction's Ref. No. field is a great feature, but this isn't yet available as mentioned by my colleague above. Your feedback matters to us, hence we've already updated how you're able to submit it to our Product Development Team. I'll guide you how:

1. Go to the Gear icon at the top, then click Feedback.
2. Enter your comments or product suggestions like "I want to be able to remove the Ref. No. field in the account register" then pick Next.
3. A list of suggested Help articles related to your comment will be provided. You can read through them or choose Skip and send message.
4. From the drop-down, choose the appropriate category, then hit Send message.

To track your feature requests, feel free to visit this site: Track Customer Feedback for QuickBooks Online.

For more details about the steps above, please check out this article: How to send feedback in QuickBooks Online (QBO)?

Meanwhile, you'll want to customize the report for a specific account by removing the number field. Here's how:

1. Let's go to the Accounting menu in the left pane.
2. Choose the Chart of Accounts tab.
3. Pick the desired bank account you'll want to make the number field blank.
4. Click the View Register drop-down the select Run report.
5. Tap the small gear icon beside the export icon.
6. Tick the check box in the Num field then click Run report to save the changes.
   
   
   

For future reference on how to get a personalized format for your reports, you can always customize it in QuickBooks Online through this article: How to customize reports in QBO?.

Leave a comment below if you still need help in managing your accounts in QBO. I'll be here in the Community to lend a hand. Take care,@PinkSunset.