To Resolve an Overhanging Corridor Surface

In the drawing, click the corridor, then right-click and click Corridor Properties.
In Corridor Properties dialog box, click the Surfaces tab.
You can also access this functionality from the ribbon by clicking Corridor tab Modify Corridor panel Corridor Surfaces Find .
In the Name column, select the corridor surface.
Click in the Overhang Correction column, and select Top Links or Bottom Links. The entry defaults to None.
Click OK to correct the overhang.