The fields you see and what you can do with them are controlled from AdminTransaction Setup. You can make personal alterations to what you see if they are not in conflict with the central setup. You can hide or reveal a field so long as it is not mandatory to either see it/not see it or fill it in in AdminTransaction Setup. To make changes, click on the icon for Columm Setup (a spreadsheet with a cogwheel in the corner) either for header fields - at the top right-hand corner of the Worklist, or for invoice rows (just above the rows of in open invoice). You can save your changes either permenantly or just for the one session.