The first part of the ZENSIE side bar provides access to the main functionality of the dashboard:
Dashboard: access to customizable dashboards.
Checks: access to the list of checks.
Explore: visualize data in a graph and compare different sensor values.
Notifications: see all the notifications in your organization and create new ones.
Export: export your data.
Account Settings: access to user profile information.
The second part of the side bar shows the organizations that you belong to. For example here, I belong to the organization Prodock.