The advanced sort options allow you to configure sort options and sort the file (or selection, if it exists). If in column mode, all of the selected lines are sorted, not just the selected columns.
Ascending
This sets the sort for ascending order ('a' to 'z', 0-9) and is the default.
Descending
This sets the sort for descending order ('z' to 'a', 9-0).
If this checked, then the associated radio button options Where all selected keys match and Where any selected keys match become active and may be selected.
See also: