The limit is adjustable on the menu for Eco pro only. But in both Eco pro & + you can override the limit either on the cruise control (I've cruised at 70mph on EP+) or by pushing the accelerator pedal to the floor. That's a UK spec BEV, in case that makes a difference
Would driving in EP with heater/aircon off rather than in EP+ be much the same, you could then exceed 56 without needing to force it thro the EP+ limit.