Desktop mode is the default view on-screen when you project opens up in Inspace. You can navigate around the model with the keyboard controls and use all the tool and scene setting features.
Desktop mode remains active as a separate camera even when another person is in VR mode. This is useful when you have one person in VR flagging problems, the desktop user can type up the comment and attach it to the element.
GIF: Clicking the red arrow icon on the top right corner allows two people to view the same project together – one in VR, another on the Desktop.