Organization's address book
To find a user's department and position in a chat, press their avatar 
→ Additionally.
User search
You can use search to find people, messages, and chats. To do this:
Note. Personal chats and contacts are not displayed in the workspace. If you haven't found a user, make sure you're in the right space.
In the Search field above a contact list, start typing the user's name or username.
Tap 
and start entering the user's name or username in the search bar.
and start entering the user's name or username in the search bar.