To change the Surface Feature files used on the path, click the Surface Features label in the Path Settings area to open the Surface Features section:
(You can also use the Surface Feature Editor to add new surface feature objects graphically from the profile.) You can choose to ignore Surface Feature files by un-checking the “Use Surface Features” box:
You could also use the “X” button to remove selected Surface Feature files from the list. The “…” browse button is used to add Surface Feature files to the list. Naturally, only surface features that are intersected by the selected path will be shown on the profile.