How can I configure Unity?
I was unable to change launcher icon size from ccsm, I find configure part as I followed steps on this link
But after log out / in again, the icon size didn't reduce.
I'm running Latest Ubuntu 12.04
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
On Ubuntu 12.04 you can do this from the appearance section of system settings.
At the bottom is a slider to change the icon size for the launcher.