All 2019 Mirage & G4 vehicles should have 6-way adjustable seats. I have not seen anything in writing that refutes that.
I would visit a dealership & look at other 2019 ES models. I would not back down, especially if you are unhappy with your seat. I wouldn't assume a 4-way seat is like a 6-way all the way down. People are making assumptions. You are missing standard equipment for a 2019.