When i do reconcile bank statement for 31/03/2020, there is no columne to fill the month end date and amount of bank balance. any changes of format.

Thanks for visiting the Community, @anonymous-b0184c. 

I'm here to help ensure you're able to enter your ending balance and date so you can start reconciling your March transactions with QuickBooks. Here's how: 

1. At the top right of your reconciliation page, click the Edit info button. 
2. The Edit information from your statement window will pop-up on the side. Based on your bank statement, Enter the ending balance and the ending date on the given field. 
3.  Click Save. 

There you go. You can now start your reconciliation for March. For future reference, read through this article: Fix issues when you're reconciling accounts in QuickBooks Online. It helps you learn about what are the causes of ending balance issues and their fixes in case you encounter any. 

Let me know if you have any more questions. We're always delighted to help.