How to set course-navigation in koa.1 like older version?

hi, all !
My edX version is Koa.1 .

After I create a new course in Studio, I found the course looks like this not the older version:

how can I get the course mode like this,

I try to configure in the SYSTEMADMIN.,“Waffle flag: course_experience.course_outline_page”,but it doesn’t work.

I think it’s about the value “disable_accordion” and had try my 80% best to do sth , but …
can everybody help me to resolve it?