Garmin Training plan distance in wrong format

I am using the Amy 10k training plan, my connect app displays all workouts as km but I have all settings as miles on the watch and on line in my profile. when I do the workout is magically converts to miles but planning routs in km and miles at the same time is a real pain. Is this a feature or a bug and has anyone got around it, I had an on line chat with Garmin Support but it was very much the typical switch it off switch it back on conversation so not very uesful.