Help with hiding altitudes

This is a slide where the students can practice drawing altitudes of triangles. I am stuck with getting CL to hide the altitudes after the student changes the triangle.

  1. Student comes into screen
  2. Student draws altitudes.
  3. Student checks altitudes by pressing the “Check” button.
  4. Student presses “Move” so that they can change the triangle.
  5. Student presses “Draw” so that they can practice drawing the altitudes-- this is where I am stuck. I can’t get CL to hide the altitudes.
    Here is the slide: Altitudes Practice • Activity Builder by Desmos