If the 2019 is the same as the 2017, they are on "auto" by default (not really sure what that means).
If you tap the icon once (one audible "beep") you get full power (3 dots), and each subsequent tap and beep decreases the power by one dot. Maybe go by the beeps you hear when you tap the icon?
If you tap the icon once (one audible "beep") you get full power (3 dots), and each subsequent tap and beep decreases the power by one dot. Maybe go by the beeps you hear when you tap the icon?