Or its just a (now) standard emergency braking feature (not meant as a substitute, but to lessen crash outcomes), not radar cruise control. If it is tho, look in the settings, maybe you can adjust something there. But radar breaking on all new-ish cars is smooth. But it does tend to sightly mimic the driving (accelerating and braking) style of the car in front, especially in cities as it tries to be polite & not make others impatient.
Also afaik radar braking/cruise control is something to turn on, can’t be on by default.