Since Canonical introduced Unity desktop in Ubuntu. Most of people are having trouble switching their computing behavior to this. If you are also using Unity desktop and want to control and configure it, then MyUnity can do this job very well. It’s very simple easy to use software that can tweak your Unity desktop.
How to install
sudo add-apt-repository ppa:myunity/ppa
sudo apt-get update && sudo apt-get install myunity
I have reduced the icon size in Unity bar. And make it auto hide.