Girls, how do you say goodbye to your child before kindergarten? We've…

Girls, how do you say goodbye to your child before kindergarten? We've just started going. The teacher doesn't give us time to say goodbye, advises us to immediately put her in a group and leave. I think we need to let the child cry, experience separation. I think maybe we should come earlier, sit on a stool with her, calm her down, prepare her. Who has any experience? We talk about everything at school, but she is happy, discusses kindergarten, how it will go. But this moment seems wrong to me, like she asks for help and calls out, and I leave.