Update default.en.md

01.curriculum/01.physics-chemistry-biology/02.Niv2/04.optics/04.use-of-basic-optical-elements/03.lens/04.new-course-parallel-1/default.en.md

@@ -1,5 +1,7 @@
 ---
 title: 'new course : parallel 1'
+published: false
+visible: false
 content:
     items: '- ''@self.children'''
     order: