How to put octopus in study?

MrAllvariant is right
After that click prewiew and it would work

"You can choose to do this in a chapter-by-chapter basis. It's called "Interactive lesson." In my study, some chapters were normal analysis (like chapter 2), and some were interactive lessons (like chapter 5):



When you create a chapter, click analysis mode -> Interactive lesson. From there, you make the moves for the main line and comment/give hints/etc for all the other moves that "fail." Keep in mind that the study will look different on your screen than any random viewer's screen, so don't get confused. Good luck!"

- NoseKnowsAll

Thanks a lot @Pandas_of_the_Night, this helped me a lot in my study!