It has been confirmed as OOTB process, that the bank reconciliation worksheet (Cash and bank management > Bank statement reconciliation > Bank reconciliation) disappears from Bank reconciliation worksheet once some of the transactions are reconciled (clicked "Mark as reconcile and worksheet closed), even though there are some unmatched transactions left in the worksheet.

The user needs to open the NEW reconciliation worksheet for the bank account to be able to see the remaining bank transactions and continue reconciling them. If the client has got 50 bank accounts, then the user will have to open the worksheet for each of them to make sure the reconciliation is complete or continue reconciliation.

We suggest that the reconciliation worksheet should stay available on the bank reconciliation screen until it holds the unreconciled bank statement transactions.