1. In menu Item for List & Search at Options Tab set Default Order to -Use Global- and Save it. This is menu point where is your articles shown. 2. In Seblods "List&Search type" open your defined search. 3. In Ordering Tab remove all fields and add only field "Article modified" and set it to Descending.
Now all your recently modified articles will be seen as first, depending on modification dates.
As far as I know this does not work by Default for Joomla! default sorting ways.