title: How to show all sub-categories articles?
body: <p>Choosing menu item type to "Category Blog,List All Categories, and Category List" would result all subcategories link not direct to all articles of sub-categories.</p>
  
  <p>But I want to show directly the all articles of sub-categories.</p>
  
  <pre><code>main-category
     sub-categories
         cat-1
              article
              article
              .......
         cat-2
              article
              article
              .......
         cat-3
              article
              article
              .......
  </code></pre>
  
  <p>Now, how to show all articles of main-category?</p>