Conversations involving multiple participants, allowing collaboration and information sharing in Teams
Yes, total fail on Microsoft's part. Program Manager needs to be assigned to remedial UX training. Chat list auto-hide needs to return with next update. Sooner if they realize what a huge fail it is. You guys have to do your complete testing cycles or, if it's considered a "new feature", whoever approved it should be demoted. Remember "The effective range of an excuse is zero meters."