These options control the maximum number of documents in your spreadsheet
and the order in which they appear.
Select the checkboxes corresponding to the columns you want in the spreadsheet.
Drag by the icon to rearrange the column order.
Select the views for which the spreadsheet should contain columns.
Hold Command (⌘) or Control to select multiple views.
When you click on Generate Spreadsheet, a new Excel spreadsheet will be downloaded to your browser.
You may need to look in your Downloads folder.