Sort Synonyms via the Sorted by menu
Click the Settings Cog.
Select Search Optimization under Analytics.
Click on the Synonyms tab.
Click the text after Sorted by:
Choose an option (Preferred Term or Synonyms) from the Select Field dropdown and/or change the Sort Order.
Click Apply.
Sort Synonyms via column headings
Click the heading of the column you wish to Sort by.
Click the column heading again to reverse the sort order.