Task lists are not sorted when using the Default Sort Order setting on a table.
Steps to Reproduce
1 - Login to an instance as administrator.
2 - Navigate to the dictionary table.
3 - Set the default sort in incident to Category.
3 - Create a new itil user.
4 - Open incidents in list view.
Observe the list is sorted by Name. This is the same for all task tables, like change requests, problems, etc.
This is expected behaviour. The functionality associated with the Defaultsort field was removed back in 2006 and is obsolete.
Related Problem: PRB582894