Hi there, jackjackson1977.
Welcome back to the QuickBooks Community. I'll provide details on how reconciliation works in your version of QuickBooks Online.
If you're referring to set your QuickBooks to Accountant view so you can delete the last reconciliation, Yes! you can go into accountant mode. This way, you have complete control over features. You can click this article to see additional information: Switch between Business and Accountant view in QuickBooks Online.
If you mean that you have many transactions to delete the entire reconciliation, you can undo them at once. To do that, you can use a special reconciliation tool. Please note that this will work if you're using QuickBooks Online Accountant. If not, you can ask your accountant to undo the reconciliation for you. Then, the steps shared above are the instructions for manually undoing a few reconciled entries.
Once done, you can start reconciling the June transactions. You can check this article to see detailed steps and information: Reconcile an account in QuickBooks Online.
If your QuickBooks account doesn't match your bank statement at the end of reconciliation, please check this article: Fix issues when you're reconciling accounts in QuickBooks Online. This contains steps on how to fix the difference.
Please let me know if you have other concerns in reconciling your accounts in QuickBooks. I'm always here to help.
