The phrase "sportiest setting" refers to making something, like a car or a device, perform at its highest level or most exciting state. It means activating the most dynamic and energetic features or options available. Full definition
I liked the Individual mode as it allowed me to request comfort (lighter) steering, which I prefer to the heavier steering normally found in sportier settings. (automobilemag.com)
This button sets the car (suspension and engine) up in its most sporty setting in one touch. (caradvice.com.au)
The driver can also use the Driving Experience Control switch to vary the basic suspension tuning between more comfortable or sportier settings according to individual preference. (ausmotive.com)