Just click the icon between the settings button and direct message button to change accounts. (rocketlawyer.com)
It expands once you start typing, and from there you can hit the new right arrow button to jump back to the photo and audio message buttons. (venturebeat.com)
This includes Location quick replies and location cards, text input quick replies, support indicators, response hours, and the prominent message button on profiles. (techcrunch.com)