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That's "Collapse Thread" / "Collapse Tree" and it's a view-only thing to make it easier to browser the comments.

• rubicon33 10y ago
  Thanks... So then, at what point does down voting become enabled?
  • jdbernard 10y ago
    I believe it becomes available once you have 500 karma. There may also be an account age requirement. The idea, IIRC, is to only give the power to people who are invested in the community.