It would be nice if we could use the tile format instead of this plain linear format
https://moodle.org/mod/forum/discuss.php?d=380547
"Tiles" format displays course topics as "Tiles", rather than as a list. When clicked, tile content is displayed under the tile with an animated transition. The layout adapts to different screen sizes and orientations.
Within each tile, activities can also be set to display as "sub-tiles".
The tile icon for each tile can be selected from a predefined set (i.e. the teacher does not need to upload images).
It is available at https://moodle.org/plugins/format_tiles
Thanks for your suggestion. Unfortunately, we will not be able to implement your idea at this time.
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Scott Christy commented
Or even better, the Collapsible Course Format...
https://docs.moodle.org/310/en/Collapsed_Topics_course_format