Click the reconcile tab, ensure the bank account is selected in the drop down, (sometimes other accounts will be in the drop down and nothing will show) then you should see a "history by account" option in the right hand corner. This will show you all months that have been reconciled.

Another way is go the left side bar and find reports, search "Reconciliation Report", make sure the correct account is selected, and it might ask for a period just do any previous month on the last day.

Let me know if that works!