How does a company make sure a person like you is happy? Genuine question. I always worried when working as a team leader that hearing nothing bad might be bad

How does a company make sure a person like you is happy? Genuine question. I always worried when working as a team leader that hearing nothing bad might be bad (and I miss a reason that someone has left). I guess you are not shy in a 1-1 to say you are unhappy about something?