People panel
The people panel is located on the right side of the screen. It can be hidden/shown by pressing the shortcut: SHIFT + P on your keyboard.
Each person in the list has a status icon next to his profile picture, the colour indicates whether the person is online, away, not available, on vacation or offline.

People are listed according to their status, online people are listed first, followed by people that are not available, those on vacation, followed by anyone offline.
info_outline Note that deactivated people are not shown in the people panel.
Clicking on someone in the people panel, will result in being redirected to a chat with this person.