Removing the Conversation Tab is being reviewed by the feature team.
For deleting chat messages, please following progress here: https://microsoftteams.uservoice.com/forums/555103/suggestions/33535006.
An error occurred while saving the commentAnonymous commented
Totally ridiculous that you can't delete a conversation in Teams. we started using Teams a year ago and already it's confusing with all the conversations in there regarding the same subject but different people. Please add the delete whole conversation not just hide.