|Use the ‘Collapsed topics’ format for your course.
The Collapsed topics format is similar to the standard topics format used on most of our courses except that all topics (except ‘0’ - the course summary at the top) can be ‘toggled’ on and off by the viewer. This reduces clutter in courses that have a lot of content. (Note this only works well if you put a brief but meaningful summary of the topic in each Topic Summary)
How to switch to this format: In the Settings block under Course administration, then Edit settings. Choose "Collapsed Topics" from the dropdown box next to Format. Then scroll down and click Save.