diff --git a/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/05.paraxial-optics/04.paraxial-optics-centered-systems/01.new-course-main/textbook.en.md b/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/05.paraxial-optics/04.paraxial-optics-centered-systems/01.new-course-main/textbook.en.md
index 8b09b293d..db2c0a73c 100644
--- a/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/05.paraxial-optics/04.paraxial-optics-centered-systems/01.new-course-main/textbook.en.md
+++ b/01.curriculum/01.physics-chemistry-biology/03.Niv3/02.Geometrical-optics/05.paraxial-optics/04.paraxial-optics-centered-systems/01.new-course-main/textbook.en.md
@@ -1,5 +1,7 @@
 ---
 title: 'new course : main'
+published: false
+visible: false
 ---
 
 new course : main
\ No newline at end of file