It seems like the Compose feature might have been removed or changed in the latest update. You can check the release notes or try rolling back to a previous version. Hope that helps!
I personally really miss having the two different tabs for chat and composer.
I liked the ability to be able to hide the chat or composer tabs if I am using just one or the other.
The new setup makes it easy to be in the wrong “mode” and not realize it, thus burning tokens and having to switch back to the mode I want to work in.
The previous version made it easier to see which mode I was working in.