prefix setting with 'desktop_' since it's only used for desktop

app/assets/javascripts/discourse/controllers/discovery/categories.js.es6

@@ -19,7 +19,7 @@ export default DiscoveryController.extend({
 
   @computed("model.parentCategory")
   categoryPageStyle(parentCategory) {
-    const style = this.siteSettings.category_page_style;
+    const style = this.siteSettings.desktop_category_page_style;
     return parentCategory && style === "categories_and_latest_topics" ? "categories_only" : style;
   }
 

app/assets/javascripts/discourse/routes/discovery-categories.js.es6

@@ -31,7 +31,7 @@ const DiscoveryCategoriesRoute = Discourse.Route.extend(OpenComposer, {
   },
 
   setupController(controller, model) {
-    const style = this.siteSettings.category_page_style;
+    const style = this.siteSettings.desktop_category_page_style;
     if (style === "categories_and_latest_topics" && !this.get("model.parentCategory")) {
       model.set("loadingTopics", true);
 

app/controllers/categories_controller.rb

@@ -18,7 +18,7 @@ class CategoriesController < ApplicationController
 
     include_topics = view_context.mobile_view? ||
                      params[:include_topics] ||
-                     SiteSetting.category_page_style == "categories_with_featured_topics".freeze
+                     SiteSetting.desktop_category_page_style == "categories_with_featured_topics".freeze
 
     category_options = {
       is_homepage: current_homepage == "categories".freeze,
@@ -37,7 +37,7 @@ class CategoriesController < ApplicationController
       format.html do
         store_preloaded(@category_list.preload_key, MultiJson.dump(CategoryListSerializer.new(@category_list, scope: guardian)))
 
-        if SiteSetting.category_page_style == "categories_and_latest_topics".freeze
+        if SiteSetting.desktop_category_page_style == "categories_and_latest_topics".freeze
           topic_options = { per_page: SiteSetting.categories_topics, no_definitions: true }
           topic_list = TopicQuery.new(current_user, topic_options).list_latest
           store_preloaded(topic_list.preload_key, MultiJson.dump(TopicListSerializer.new(topic_list, scope: guardian)))

config/locales/server.en.yml

@@ -1148,7 +1148,7 @@ en:
     min_title_similar_length: "The minimum length of a title before it will be checked for similar topics."
     min_body_similar_length: "The minimum length of a post's body before it will be checked for similar topics."
 
-    category_page_style: "Visual style for the /categories page."
+    desktop_category_page_style: "Visual style for the /categories page."
     category_colors: "A list of hexadecimal color values allowed for categories."
     category_style: "Visual style for category badges."
 

config/site_settings.yml

@@ -157,7 +157,7 @@ basic:
      - facebook
      - google+
      - email
-  category_page_style:
+  desktop_category_page_style:
     client: true
     enum: 'CategoryPageStyle'
     default: 'categories_and_latest_topics'