Hello Joseph - the collapsed topics plugin can be found here: https://moodle.org/plugins/view/format_topcoll - you can see a couple of screencasts on that page too.
Courses and course formats
Collapsed Topics Plugin?
دا بحث کولپ شوی دی نو تاسو نشئ کولی دې ته نور ځواب ورکړئ.