If your open plan living area maintains a constant temperature across all parts of it, the simplest way to control this is as a single zone on the App.
The Genius Radiator Valves can individually measure the temperature to keep all areas at comfortable temperature of your choice.
If one area has a considerable different temperature you can try setting a Hidden Valve Offset for that Genius Radiator Valve so that it will individually work harder/less hard than the others in the zone.
See this link for setting a Hidden Valve Offset