If you would like to see all the transactions you have processed for a given date, or range of dates, as well as know the total of these transactions, you can use the Merchant Totals report. This will provide you your totals, regardless of how many merchant names you have entered.
This would be useful if you are responsible for reporting your sales back to your organization or your accountant. When you choose to run the Merchant Totals Report by 'Transaction Date', you will be shown all the transactions that have occurred on that specific day.
If you choose to run the Merchant Totals Report by 'Settlement Date', this report will show you all the transactions that have cleared your bank account on the day you have specified, but not necessarily all the transactions that occurred on that given day. This is why the 'Transactions Totals' and 'Settlement Totals' are likely not to match.