You can pull up the Transaction Detail by Account report to see your supplier or vendor's statement with the debit and credit information. I'll guide you on how to customize the report.
Sign in to your QuickBooks Online (QBO) account.
Click on Reports at the left pane.
Look for Transaction Detail by Account, then open the report.
Go to the Customize tab, then filter the Name to the supplier's name.
Tap on the Run report tab to refresh the page.
You can then go to the small gear icon to select the columns you want to add including the Debit and Credit.