In Garmin Connect course creation, it seems that you have to go to the end or the beginning and start deleting points and redraw.
I agree. It's a DREADFUL route editor, frustrating to manipulate, and having to switch between biking, hiking, and other modes to get the path to cling to the trails I WANT to ride on (away from the road). I think I'll have to export the course and edit it in a more capable APP and bring it back in to load it to my Garmin Edge.