Why the resolutoin is much smaller in the viewer than the actual display?

[TianyiChen-1]

The actual display is 2880x1880, but the one I got in the viewer becomes 1440x900, I did my best searching for a possible answer, and this post would be my last try. Please help me!

[stweil]

The Retina display resolution is scaled down by a factor 0.5.

[TianyiChen-1]

The Retina display resolution is scaled down by a factor 0.5.

Thanks for reply, but how I could change this factor to whatever I want? It seems that there is no command line option or any option in the server GUI application.