when addtional package changes are being applied to satisfy what the user requested, a window with a simplified tree view comes up. this tree view has neither columns nor fold/unfold handles on parent nodes; it does however react to key input. namely, when one presses the left arrow key the parent current node will be folded allowing the user to hide information without any visual cue as to how to unhide it. Reproducible: Always
Created attachment 84890 [details] snapshot of folded Install node
There is no visual, but the right-arrow reverses the action of the left-arrow. I think this is sufficiently obvious as to not merit any change. (Maybe it didn't do that in the version you were using.)