In this menu Here you can change some configurations for find some technical data about your reports once they are saved. In the static choices field you will find the options you have selected before saving so you can change these if needed without having to go through configuration and save your report again, once you have created them.
It is possible to change the reports by changing the "static choices" field, but we do not advice it, as it is really easy to make a mistake - and your report may end up being ruined.