Workspaces: the basic tool for project management is the Kanban board (see Main Board), but you can change it here.
Shared Organizations: invite organizations to the project. You can invite only registered on Aitheon organizations. Members of these organizations who have access to the project you can find in the Members page, the Shared tab.
Don't be confused: there are Settings in each project (see above) and entire Project Manager service Settings.
The Settings page allows you to set up your notification preferences.