All Mirage (4 trim levels) & G4 (2 trim levels) in 2019 should have the wheel knob on the seat, because that became standard equipment in 2019. It's what makes it a 6-way adjustable seat.
The 2017-18 Mirage & G4 ES trim levels do not have that knob. Look up a 2018 G4 & 6-way seat is not available on an ES. In 2019, it is standard equipment.
The 2019 models got 6-way driver's seats & cruise across all trim levels. That changed the base level ES models only. The other trim levels already had that stuff.