A site setting for how many similar topics are returned

app/models/site_setting.rb

@@ -161,6 +161,8 @@ class SiteSetting < ActiveRecord::Base
 
   client_setting(:educate_until_posts, 2)
 
+  setting(:max_similar_results, 7)
+
   def self.call_discourse_hub?
     self.enforce_global_nicknames? && self.discourse_org_access_key.present?
   end

app/models/topic.rb

@@ -223,7 +223,7 @@ class Topic < ActiveRecord::Base
          .visible
          .where(closed: false, archived: false)
          .listable_topics
-         .limit(5)
+         .limit(SiteSetting.max_similar_results)
          .order('similarity desc')
          .all
   end

config/locales/server.en.yml

@@ -425,6 +425,7 @@ en:
 
     category_colors: "A pipe (|) separated list of hexadecimal color values allowed for categories"
     max_upload_size_kb: "The maximum size of files we allow users to upload in kb - be sure to configure the limit in nginx (client_max_body_size) / apache or proxy as well."
+    max_similar_results: "How many similar topics to show a user while they are composing a new topic"
 
   notification_types:
     mentioned: "%{display_username} mentioned you in %{link}"