When a user visits your site from a search engine most of the times, Google Analytics recognizes it and classifies it as Organic Search in the Traffic Reports. But if the search engine has not yet been added to the official search engine list, the traffic will be classified as Referral instead.
For example, in the referrals report below, you can see that the search engine duckduckgo and google.fr has been wrongly classified.
To redirect Duckduckgo as an organic search channel a filter needs to be applied instead. Read about it at the end of this article.
Note: These changes are made at a property level, so they will be applied to all views.