diff --git a/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/07.optical-instruments-design/01.optical-instruments-characterization/04.new-course-parallel-1/default.en.md b/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/07.optical-instruments-design/01.optical-instruments-characterization/04.new-course-parallel-1/default.en.md
index c5ea2af52..3d4d0456d 100644
--- a/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/07.optical-instruments-design/01.optical-instruments-characterization/04.new-course-parallel-1/default.en.md
+++ b/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/07.optical-instruments-design/01.optical-instruments-characterization/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: