It appears Freshdesk does not have the ability for a customer to “Sort” their search results, either on the home page or on the search results page. Sorting is a basic function for most result lists and should have a ticket opened to add this functionality on both pages.
My suggestion would be a way for the Administrator to configure their customer portal for the initial search on the home page. For example, I would like those search results to return initially from newest to oldest as I’m utilizing knowledge base articles, of which, I would like the newest articles to show first. Then if the customer wants to execute the search and move to the search results page they then can choose how they want the results to be listed: Date Order, Alphabetical, or Relevance.
Screenshots attached for visibility of the pages.

