Good morning.
This is a new issue, and none of the fixes client-side will remedy. The structure of the toolbar itself has changed, and for whatever reason, there does not appear to be any way to put the Teams chat layout back to the original layout.
Again, this is novel, and does not appear to be something the user can remedy. My guess is an update just occurred that has not finished propagating.
"New" appearance (Note that you can still use gifs by clicking on the smiley icon. It's all rolled up under that icon now):
All of my users' desired appearance (what it has been from day 1):

Also, using the web version is not a valid workaround as it carries this behavior.