Conversations involving multiple participants, allowing collaboration and information sharing in Teams
I've been trying to find the thread in which this "feature" was originally requested. ( I'd be tempted personally contact each of those voters, and ask if they're happy with how the change has been implemented - it's hard to imagine they would be ).
I see there is a suggestion now in the feedback portal to make the sort order an individual preference. Allow Sort order to be set according to individual preference.
I have added my vote there, and will repost this message on all the various threads where this awful change is being discussed.