It looks like this suggestion was brought up near the beginning of the beta. I’m not sure I understand how the other users want this to work but I was just thinking it could have the standard option button – click to collapse everything and another option-click expand all.
When I place an element on the page and follow along with the tutorials it is difficult to find where the settings are when so many are open at once. There are some programs that even have the option of only having one section open at a time so that when you open one section the previously open section closes. Not everyone likes this which is why this is set as an option.
Add this feature would make elements so much more usable.