By default Unity launcher position is fixed on left side of the screen. It is very useful to have it with auto hide option enabled, so we'll explain how to configure auto hide unity launcher in Ubuntu 12.04 Precise Pangolin.

How to enable auto hide unity launcher in Ubuntu 12.04
Here are the steps you should follow in order to turn on unity launcher auto-hide:

1) Go to Dash

2) Run System Settings

3) Click on Appearance in Personal section

4) Select Behavior tab

5) Turn on Auto-hide the Launcher

6) If you want you can change reveal location and also configure sensitivity