Not sure if this is the correct section. On the info screen yesterday I had the option to select eco, normal or sport mode. I selected eco. Today it appears to have defaulted to normal mode. How do I get the option screen to display again?
Press the MODE button next to the gear selector. If you have Drive Mode Select then you get Eco, Comfort, Normal, Individual, Sport or Snow. If you don't have DMS then I think you don't get the Sport, Individual or Snow modes, but not 100% sure. If you have a 4x4 version then you should have a separate Off Road button to select that mode.
Sadly the car won't stay in Eco by default, you'd have to select it each time you start. From many people's experience here, it doesn't improve fuel economy anyway, it just makes the gearbox seem sluggish and reduces the effect of the aircon a bit. On that basis, it's really not worth using.
There's info about it on page 172 of the PDF manual: