Possible Duplicate:
How can I configure Unity?
In 11.04, how do I resize the panel? I right-click, but nothing happens?
Possible Duplicate:
How can I configure Unity?
In 11.04, how do I resize the panel? I right-click, but nothing happens?
This is not possible in the current version of Unity.
You can change Unity Launcher icon size, so it will be smaller / larger, depends on how you want.
Second post in: How can I configure Unity?
You cannot right click the unity panel, nor customize it, other than to change the theme.
There are a few customization options in the Compiz Settings Manager, including the ability to change icon size, which will, in turn, shrink the size of the panel.