How do I fix the bank register view so I can view the running balance again?

There's a customization feature in QuickBooks Online that allows you to hide or add columns in your Chart of Accounts, lizpaquette.
 

Let me outline the process for adding back the bank balance columns, which will only take a few steps. 

Here's how you can do it:

1. Go back to your Chart of Accounts.
2. Click the small Gear icon just below New.
3. Check the boxes for QuickBooks balance and Bank balance.

Let me also share these articles for more details and guidance when working with your bank in QBO:

• Get Bank Statements Directly From Your Bank When You Reconcile In QuickBooks Online
• Interest Or Bank Charge Shows Up Twice When Reconciling And In The Register In QuickBooks Online

Feel free to reach out if you need any additional assistance working with bank transactions or reconciliations-related tasks in QBO. The Community is available anytime to provide assistance and ensure everything is taken care of.