Persistent vertical navigation, with a responsive transition to icons-only and then "sandwich" menu with a pop-down list. Member Account menu and Plus menu are also presented as vertical lists.
By default, Decorous is styled for dark-background navigation and light-background content. All the styles can be edited via Styles editor since Decorous supports Style mixes.
Full-page layout apps like Jot Messenger integrate with the Decorous vertical menu and maintain consistent behavior.