When collapsing/unfolding a foldable element, there’s no way to additionally collapse/unfold all its children
Proposed solution
Most applications with nested foldable, allow you to alt+click to collapse/uncollapse all its children, together with the parent node itself, which I expected to work in Obsidian as well.
Can’t it be used for both? alt+clicking fold/unfold doesn’t seem to do any valid action right now anyway. That said, I’d be fine with using a different key too! As long as there’s some way to fold recursively