i try to make appear the 4 levels when I click on this theme, as on the thme "mathematic"

01.curriculum/01.physics-chemistry-biology/topic.en.md

@@ -2,10 +2,9 @@
 title: 'From my perceptions of the external world,<br>To physics, chemistry, biology, and to industrial and environmental sciences<br><br>'
 media_order: sciences_400_2400_web.jpg
 slug: physics-chemistry-biology
-content:
+<!--content:
     items: '@self.modular'
     order:
         by: ''
-        dir: ''
+        dir: ''-->
 ---
-