Chapter 10 Install and System Administration for FortiOS 5.0 : Using the web-based manager : Basic configurations : Switching VDOMs
  
Switching VDOMs
When VDOMs are enabled, a menu appears in the left column called Current VDOM. This menu displays a drop-down list that lists the configured VDOMs.
To switch to a VDOM using the Current VDOM menu, select the VDOM that you want to switch to from the drop-down list. You are automatically redirected to that VDOM.
VDOMs are enabled on the System Information Dashboard Widget.