I've been playing with course blocks recently and found myself not really knowing what "any course main page" actually means in the settings.
For example, why should blocks configured with this setting and added on a given course main page also show when clicking on the Navigation > Participants? (This is what I encounter when adding "Activities" or "Section links" blocks on the course main page and leaving the default "any course main page" for visibility - Moodle 2.8.2, but I think I've seen this behaviour in earlier versions as well.)
Is there a list anywhere specifying precisely which course contexts belong to the "any course main page" set?
I've tried to look for solutions but the blocks documentation is silent about that. Some good discussion is here https://moodle.org/mod/forum/discuss.php?d=231002 , but it doesn't quite hit the nail on the head for me.