I've noticed that when you choose Collapse Map under the View tab on the ribbon the whole map is collapsed as expected, including sub-topics attached to floating topics. However choose any level under the Expand button on the same ribbon (including Show All Levels) and only the main map is expanded. Floating topics are not affected and have to be expanded individually using each floating topic's + button.
Does everyone have the same experience? I can't see any logical reason for this so I assume it's a bug.