Agreed, it should be visible and a sortable column, in fact any information in the transaction should be available as a sortable column.
Makes the software interface seem rather out-of-date having to dive into each transaction to see a note.
You should also be able to see a transaction "Description" AND "Bank Detail" at the same time, not have to choose. One is very easy to read, the other contains extra useful information, they complement each other.
Good software, UI needs some critical work though.