Use this menu option to either see the current column properties of change the column options. The details of this popup is covered as part of the Edit Design.
This will allow the user to add a new column/field to the left or right of the selected field in the listing. Details of the Add New Column is covered in Edit Design.
Click Hide to hide the selected column. The Show menu shows a popup box where all the hidden fields are show. Select the field you need to show and select teh left or the right button to show in the listing.