Is there a way to customize the A/P Aging Summary Report? How can I remove the 'current' row and change '1-30' to become '0-30'?

Hello, @accounting-emint. Allow me to answer your questions about A/P Aging Summary Report customization in QuickBooks Online (QBO).
 

Regarding your first question, the answer is yes. You can modify the A/P Aging Report, but the available options are limited. As for your second question, there isn't a feature that allows for the removal of the current row display or alteration of the 1-30 range to 0-30 as it is determined by calendar days. 

Furthermore, if you want pull up more detailed report, you can use A/P Aging Detail Report. 

If you wish to share your custom reports to other members of your team, refer to this guide: Manage and share custom reports in QuickBooks Online Accountant. 

You're always welcome to comment in this thread if you have additional questions about customizing A/P Aging Summary Report or any other concerns inside QBO. We're always here to help. Have a good one.