I think this UX would be much more usable if each zone would display a pace range, e.g. “< 6:22/km” for Z1, “6:21/km - 5:38/km” for Z2, “5:38/km - 5:14/km” for Z3, etc.
@david I was going to report the same thing when I found that this was already reported.
Would it be easy to change this to be a range in all places where we see it?
Nicolas example is on the settings, my example (attached) is on the activity pace tab.
AFAIK Intervals does not support non-adjacent zones, so the top of a zone is the bottom of the zone just above.
Or did I not understand the request correctly?