I think that for “parent” it means the comment you are clicking, eg.:
|-- comment A
|---- subcomment B
if you have that enabled and you click on A, both A and B are collapsed
if you have that disabled and you click on A, only B is collapsed
due to my username, I am morally obliged to comment :)
ten years of sync and I never noticed that, thanks!
@beyond@lemmy.dbzer0.com