In the current configuration for the Launcher3, I cannot find where to change the configuration of height width, in order to be able to have more icons on the screen. Is it anyway how to configure it?
Launcher3 is an AOSP (stock) launcher with the most basic features, there's no way to configure it. I suggest you to install a third party launcher from Google Play Store. I prefer Holo Launcher but there are a lot of other options for your choice.