You've come to the right place, @tracy who. I can provide clarification on undoing a reconciliation.
It's often recommended to consider multiple things prior to unreconciling a transaction or undoing an entire reconciliation. For example, the root cause of an issue can often be fixed without having to undo the entire reconcile. I'm including an article that goes over this and includes the necessary steps: How to Unreconcile a Transaction or Undo a Reconciliation.
Additionally, should you decide that you want to undo an entire reconciliation and have an Accountant User connected, you may want to consider reaching out them. This user type has special tools to assist with undoing a reconcile.
That's it. I believe that this will help to get you back to business.
Should you have any questions on reconciling or anything else, please don't hesitate to let me know. Good day.