List box data can be sorted by column. By default, the Definition view is sorted by Name. If you want to sort the data by thickness, click on the Thickness column heading and the data is sorted by thickness. There is also a small arrow in the column heading to indicate that the data is sorted by that column in ascending or descending order.

The display of columns in the list box can also be changed. A Right click issued in any column heading opens the Show / Hide Attributes dialog, where column display is turned on and off.