With the old WEB app (https://flex-app.rach.io/) I can add/remove and re-order zones in a schedule. This capability has apparently been removed in the new software, even for fixed schedules. I don't see how adding/removing, and specially reordering zones would have any effect on the frequency or duration of other zones in the fixed schedule.
Yes, it might change the over all duration of the schedule (undoubtedly if a zone is added or removed!) But the frequency is determined by the fixed watering days.
I ran into this because I wanted to change the order of zone watering so that the zones likely to be watered when the "watering police" are awake were not visible from the street. (they are dinging me for getting 6 inches of the sidewalk wet!) Fortunately the flex web app still allows this.
The way this was handled in the old interface is perfect. Please reinstate it. At least for fixed and flex schedules.