How can I print off monthly bank details.

Hi there, 

QuickBooks Online makes it easy to print your bank register and I'll show you how. 

To do this, follow the steps below:

1. On the left tab, click Banking.
2. Click Go to Register in the Banking page.  
3. Select the Print icon on the left side option. 
4. Click Print. 

For additional reference, you can check this article on how to : Sort and filter transactions in a register.

Don't hesitate to add a comment below if you have additional questions about the bank register. I'm always here to help out.