The AutoCAD Civil 3D ribbon is the primary user interface for accessing commands and features.
The AutoCAD Civil 3D static ribbon tabs include the Home, Insert, Annotate, Modify, Analyze, View, Output, and Manage tabs. Static ribbon tabs are always displayed when the ribbon is turned on, and they contain most of the functionality located on the menu bar drop-down menus and toolbars. Static ribbon tabs have a gray background color.
Contextual ribbon tabs are displayed automatically when you select an object or invoke an object-specific command. For example, when you select a pipe network object, the Pipe Network contextual tab is displayed.
When multiple types of objects are selected simultaneously, the Multiple contextual tab is displayed in the ribbon. For example, if you select both a pipe network object and an alignment object, the Multiple contextual tab is displayed.
The Section Editor tab includes some ribbon behavior that is slightly different than the other types of contextual ribbon tabs just described. The Section Editor tab lets you perform a variety of corridor section view editing functions. You can display the Section Editor tab by clicking Corridor Section Editor on the Modify panel of the Corridor contextual tab, or by selecting View/Edit Corridor Section from the corridor object shortcut menu. This tab remains active until you click the Close button to remove it.