The main navigation in Falcon is via the sidebar. The icons allow you to perform the following actions (from top to bottom):
Switch to the dashboard.
Change in the project view.
Expand / collapse the project tree.
Reload the selected view.
Administration (Hub User Management, Hub Schedule Management, Hub Workflow Management, Hub Tag Management)
Main menu (User Account, About Falcon, Logout).
Please note: Depending on the individual user permission, not all users might see/access all function of the sidebar.