How do I get the section views to display the full section as opposed to just the top of surface?
go back to your sample line group, and tell it to sample MORE sources
however first you may need or want to go into your corridor parameters, and create a surface for each link in your assemblies you want to appear in your sections when you create them, or if created in the dynamic mode; you sample MORE Sources with the sample line group properties, then the links, and shapes will appear in section. The graphical display of all of the above is controlled by the Code Set Style being applied to the assembly/corridor.
Although you will discover that you DO NOT want to see all of these surfaces from the corridor links in section, you really want to see ONLY the corridor objects. Otherwise you will see a lot of surfaces doing things they should NOT be doing in those sections, UNLESS you add a lot of break lines and boundaries to same. This is do to the feature lines, and link codes being joined across the roadway section.