Where was that new topbar button mentioned?

An employee posted an image of the topbar where the topbar had another button on it, and for the life of me I can’t find that post. Does anyone else remember which thread that image was posted in?

Did it look like the one in this tweet? x.com

That might have been it. What does that button do?

Not sure, let me upgrade the mobile client on my phone and I will check it out.

Mobile only, show/hide chat.