About the Toolspace Settings Tab
You can use the Settings tab to manage styles for AutoCAD Civil 3D objects and to control settings for drawings and commands.
About the Settings Tab Icons
Use the icons at the top of the Settings tab to control the display of icons within the Settings tree, to display the Panorama window, and to access Help.
About the Object Collection (Settings Tree)
Use the object collection in the Settings tree to access object styles, settings and drawing-related information for a class of objects.