You are able to delete your own messages within a chat or channel. Click the ellipses on your message and you can then use the drop down menu selection of Delete to remove your own message.
You cannot delete old chat threads, but you can hide them by clicking the ellipses and choosing Hide.John commented
The Chat and Conversation pages get cluttered very quickly. The ability to delete posts would greatly benefit those of us that like to keep an organized space for easier collaboration.John supported this idea ·