Can you see this topic?
https://e621.net/forum_topics/36576

I accidentally push hidden button then I can only see my own comments.
But I can't see others comments.

I mean I wanna hide it from public to prevent other comment. But I still wanna see all past comments made to that topic.

IMO, users shouldn't be be able to hide whole topics. Being able to un-hide posts would be nice too (though I can see a small potential for abuse), but normal users shouldn't be able to prevent other normal users from reading and commenting on what others have said. It should either only hide the first post but leave the rest of the topic visible, or if there's some internal reason a topic's visibility is tied to its first post, prevent hiding the first post except by moderators.

Nope, can't see it. Maybe there should be added a feature where the OP can lock their thread, instead of hiding?

I think hiding stuff should be a mod-only feature. It's quite odd for me how an user can hide but not unhide stuff .3.