ou can collapse current Project as far as I know.
Can you collapse/ open all the subfolders in one go? e.g.
Space Blaster
--Layouts
-----Title
-----Game
--Event Sheets
-----Game Events
-----Title Events
--Object Types
-----Background
-----Background2
-----Background3
-----Background4
Close All would produce
Space Blaster
--Layouts
--Event Sheets
--Object Types
Then I could just open the subfolder I was working on. Hope that makes sense. :)