There used to be a lot of knowledgeable people on this forum, but the Venga is a great automobile for older adults like my wife and me who have arthritis. Simply said, our advanced age is causing our extinction.
Because a back voltage is a common symptom of a blown fuse or a jammed or gone-of-control relay in Kia electrice, you might want to check those first.
It seems like the anti-lock brake system relied on a toothed wheel—which might easily get jammed or rusted—to detect the wheels' speeds.
As far as I can tell, the glowing light just modifies the suspension to make it more sporty.
The E/M/S buttons on the left are responsible for adjusting the engine's characteristics; this button does not accomplish that.
Is it possible that the vehicle has detected your preferred driving style and adjusted the suspension accordingly?