On the Low Enroute chart the course line covers the victor airway number and makes it unreadable.
While flying, I found a quick workaround right away: if I touch the screen, the thick highlight line goes away and leaves only the thin solid line in the middle. It worked in most cases, but there were still a couple of times when I could not make out the airway number. I would suggest making the course line either more transparent or putting a setting to allow the user set transparency of the course line. I can see that some pilots may prefer the line as visible as possible.