I have used a forerunner, and have always made my own workouts, fi interval, where I set the target speed at for instance 10-12 km/h. when i run the watch shows the target for the next lap in those terms, not minutes per km.
in the new fenix 5x plus i use the same workouts, upload with garmin connect, and they show up on the watch as min/km.
i find this annoying and can't change it.
Any suggestions?