No. You can use the toggles on the left navigation bar to turn on the sections you will be measuring. It is best to decide this at the beginning of a project to make data collection easier. You do have to fill out data for each section that is toggled on, otherwise you will not be able to complete an event. This is to stop people from forgetting to enter data for sections they are measuring. However, if you toggle a section off, you do not need to complete it.