When expanding list items to reveal more details, clicking an item once expands it. To re-collapse it, in theory I am supposed to click somewhere outside any list item, i.e. on the list's background. As the layout for the various lists seems to be slightly different, I have varying success with re-collapsing list items.
To me it would seem much more intuitive and a lot easier to accomplish, if I could just click the expanded item a second time to re-collapse it. I.e. single-clicking it would just toggle the expanded/collapsed state.