The Fields tab is used to select the fields that will appear in the export and is divided into the following sections.
The Fields section contains:
A list of field names that can be used as columns in exports
A Search text box that lets you search for field names
A button that adds a selected field name to the Columns section
Click for more information on the Fields section.
The Columns section contains:
A box that contains field names that were selected to be columns
Controls that lets you change the order of columns
A button that lets you delete a selected columns