In QuickBooks Online (QBO), you can correct the accounts' opening balances by editing them in the Account history. The steps to do it are pretty quick and easy.
Here's how:
In QBO, go to the Accounting menu at the left pane to get to the Chart of Accounts page.
Find the account and click Account history under the Action column.
Locate the opening balance entry.If you've got the Date column sorted from newest to oldest, the opening balance entry may be at the end of the list.
Choose the opening balance entry and edit the amount.If you can't edit the amount on the screen, you can click the Edit tab.