To change Expense Types, there is no need to edit them one by one on the expense pages. Instead, go to Finance -> Expenses and double click on a cell of your choice to edit. The change will be made across its related Bookings, Expense Page, and Profit Reports.
Note: If an expense is manually entered, it can be changed. If it is automatically entered as Transaction Cost or Channel Commision, it can’t be changed or edited; you will come across an error message like the one below: