I bought a 2017/8 Superb 2.0cc  280  4x4 only had it a week and have noticed this mode button light is on all the  time.  Should this be on ? Cant really say I can find much in the manual about it . I have read for error codes and non refer to this

Hey, when you press the button, does it say what mode you are in currently? I've found that being in any other mode other than normal, it stays lit. So if you're in Eco, Sport, Comfort or Individual, it will be lit.

Thank you. Its in eco ATM I will try Normal next time I go out in it

+1 to wat @DoDaniel said - it lights up when ur NOT in Normal driving profile.

Same with the stop/start. Only lights up when you switch it off.