I have the same car here are what all the buttons mean.
1st - Traction control. Keep it on. It helps improve grip and you will hear "clicks" when tyres are slipping different to ABS.
2nd - Your model has radar like mine. Keep this on. If the car senses you are closing distance too fast with vehicle in front and don't have foot on break it will start to beep. It also helps if you are in traffic jam or signal and the front car moves, if you don't move then it makes a beep to tell you that the front car has moved. Its very useful.
3rd - Eco mode, slows down AC and other adjustments to make fuel economy better.
4th- EV mode. Turns on just the electric mode if you have enough battery. In this mode even if you go at a higher speed the car will keep the engine off until its max capacity or the battery drains enough. If it makes beep sound when clicking then the car doesn't have enough battery to engage this.