Messenger Demo Viewer is a free cross-platform and open source Facebook Messenger viewer that hides your sidebar by default. To show or hide the sidebar, press cmd/ctrl + b
Facebook Messenger always has a sidebar with all your recent chats, including a part of the last message sent, visible on the screen. This is useful for personal chats, but in a professional demo you'd want that to be hidden. That's what Messenger Demo Viewer is for.
Source code is available at Github. You can report issues and send pull requests there.
It looks like Messenger, because it is :)
Showing the A Messenger Adventure chatbot.