if you use account numbers for your Chart of Accounts e.g. to match your accountant's system, you often might need your Trial Balance to appear in the same order as theirs, which is usually numerical by account number. At the moment you can only sort this report by default (which is account type then account number) or total. The only way to get the data in "pure" account number order is to export your report as a spreadsheet and sort in Excel - fiddly and potential for data to be inadvertently changed.