The general view of Communication Hub of the Constructor Learn is shown in the screenshot below.
According to the numbers in the screenshot, Communication Hub UI has these main parts:
1 — the exit Communication Hub buttons; it returns you to the My courses page.
2 — the chat menu where you can search for channels, change the chat view, and add channels, messages or discussions.
3 — the list of available teams and channels.
4 — the menu that contains the information about the team and search for the threads, team channels, discussions, team members, messages, mentions, notification settings, and so on.