shortcut to close multiple folders in List View

In the Finder, in list view, I have multiple folders open (using the triangle by the Folder name). I'd like to be able to close all the open folders at once. I know that holding Option while clicking the red Close button on a window will close multiple windows and I want to do something similar with the folders.

I'm sure I knew how to do this once but can't remember now.

Thanks,

Steve