Jay's solution will get rid of the corridor insertion lines, but not the links, points and shapes which are inserted by the assembly, and are also visible in plan view.
What you need is a code set like this one, where all of the assembly features are set to use a No Display style. You will need to edit a copy of the Standard point, link and shape styles and then use those new styles in your new code set. Once you have it working I recommend that you copy this new code set to your template drawing, as you'll be using it on most of your design projects.
Steve Please use the Accept as Solution or Kudo buttons when appropriate