I'm not sure that I understand.
It should not show "All the topics and content" just the topic headings and anything in the description field, in one scroll of death.
Click on a topic name and you should see JUST that topic, name, description and content - (plus the section zero)
- If you can install plugins, then you should install a course m,enu
- Section zero should contain almost nothing.
- Section 1 could say "Start here" and then when it opens you give more guidance
- There are various other formats as Jez has indicated.