What does that mean?

[slo-climber]

I'm just curious what does that mean. Look the picture below. Is not display supposed to be at 2880x 1800 ?? What does 3360x 2100 mean?

Thanks

 

[Quackers]

Have you set the resolution to 1680 x 1050?
On "best for retina" it will show 2880 x 1800

 

[Barney63]

You have your resolution set on the 4th option, between "Best for Retina" and "More Space"

Barney

 

[slo-climber]

Yes, now I have set it to 1680 x 1050.