Awesome to see that there is something similar to this however it feels like half of what I would expect, the fact it deletes the ... after you click it to expand.
Maybe instead have it be +++ when closed and when you click it, it changes to ---, and if you click that it closes again.
That way it feels responsively consistent instead of having to constantly add ... (or having to resort to using shortcuts) when you're just looking through each section of collapsed for specific stuff to work in.