Here's how you can add or remove items in the iTunes 11 sidebar; including Movies, TV Shows, Podcasts, Books, and other items.
1. Open the iTunes application.
2. Click on iTunes in the menubar.
3. Click on Preferences
4. Click on the General tab.
5. Go to the Show section (under Library Name).
6. Click the checkbox next to each item to add or remove it to the sidebar.
7. You can add or remove the following items: