How to set screen sharing resolution?

Dears,
does anybody know how to increase quality (resolution/bitrate) for screen sharing?

Regards

In your config.js:

testing: {
p2pTestMode: false,
capScreenshareBitrate: 1
},

Mmmh… well I saw that.
But how does it work?
I mean, what settings are changed by setting 1?

Regards