It is controlled by the "Code Set Style" that was used to setup your corridor.
Go into your corridor properties, click on the "Codes" tab and make note of which one was set, in my case I have one that is "Codes for Corridor"
The linework that is perpendicular to CL are controlled by the "Link" code in your set. I didn't like seeing all the section lines either so I have most of these set to "_No Display", see image. If you change the code set style ONLY these lines are linked back to the code set.
Now this is where it's fun, the feature line codes that are ORIGINALLY part of that codes set are separated out to the "feature lines" tab. This is the linework that is parallel with CL. I have mine set to only show CL, EOP, CURB (face,gutter, top, back), SIDEWALK, HINGE, and DAYLIGHTS.
Once you have created a corridor you have to change these within the corridor, but if you standardize the settings then you can setup the code set style and force that one to be the default in the command settings:
Settings tab- Corridor- Commands- Create Corridor- Default Styles- Code Set Style
Bruce
Bruce Klug, P.E.
AutoCAD Expert Elite Alumni
AutoCAD Civil 3D Certified Professional
Civil 3D 2023.2.1
Win 10 Enterprise, 64-bit