you’re able to go for the items and see a preview on the right.
Once you select that option, you’re able to resize the sidebar like any other window.
Applying Themes To Your Windows Vista Sidebar
The look of the Windows Vista Sidebar is a little drab, and there's no way to customize it with the default tools in Vista. Thankfully third party developers have stepped up to the plate and created an application that will let you re-theme the sidebar.
