There was a feature in the text formatting options that allowed you to hide text. People typically used to address things that were off-topic.
I believe the code looked like this:
OFF TOPIC
Hidden Text.
What happened to it?
I don’t see it anymore in the UI.
Why does the code also not work anymore?
I don’t use PG on mobile, but thanks for letting me know. This is so weird because just a couple of days ago, it was available on desktop, and now it’s not anymore, which made me wonder if it was deliberately removed. Now I wonder if it’s a bug. I’m now noticing from your sreenshot that many other formatting options were removed too, like the spoiler blur.
Are you doing it via code or via the UI on desktop?
Your screenshot suggests the latter. This is so weird because I don’t see it anymore, as you can see it in the screenshot I shared. Also, when I copy and paste the code, it is not reflected in the preview.
You click the “+” icon and you’ll see it in there. No code.
I know. I don’t see it. See the first screenshot I shared. It’s not there for me. It used to be there, but it’s not there anymore.
Odd its not there for you and there for me. What browser are you using? I’m on FF.
I’m also on FF. It was literally there just a couple of days ago.
I don’t know what else to say 
This is so weird. I just logged in my account in the same browser (FF), but in a private window, and I see hidden text formatting option, as well as all the others that were missing.
So I thought, maybe I’ve been logged in my account to long on this browser, and I need to log out and log back in again in the normal window. I tried doing that, and it did not fix the issue. I am still not seeing the hidden text option when I used to just days ago.
Why am I seeing it in the private window but not in the regular window? I haven’t installed any new extensions in the last couple of days. The only difference is that with the normal window PG is in container, but it has always been.
I don’t get it.