Sections are sorted numerically upon submission. You can use this field to edit the order of your sections. So that it is not necessary to change all order fields, you can use decimals to ease sorting.
For example, if you wanted to make section 5 appear first, you need only mark its order as .5, rather than shifting all order fields up one. Thus, the former Section 5 will now appear first, Section 1 will then appear second, and so on.