Inbox changes?

There is one on the page to send comments to a thread, but not on the pages to send a private message from a thread or from your inbox. I think those two are the same page.

I don't even have a preview button on my "send" page!

You are right - I was expecting to see the emoji lists etc, and was surprised when I couldn't, but thinking back to the last time I used my inbox (a while ago), I don't remember them.

I never saw those on my inbox page. I can see them underneath this message box, as usual.

It is the inbox page and the private message page, not the comments box.