MAKE IT YOURS
Installing add-ons is simple. Foobar2000's official download page has a section dedicated to all the components you can grab to customize your listening experience. These are downloaded in the form of a .dll file. To enable them, simply drag the file into the Components folder in the installation directory, and you're all set. Unless otherwise stated, all the add-ons we talk about here can be found on the main website and enabled in this manner.
You'll also need to navigate to the View menu, hover over the Layout button, and then enable layout editing mode before you begin.
Next, click on 'create a scratchbox' in the same sub-menu to start setting up your own custom layout. This calls up a blank window pane in which you can add UI elements of your choosing. Simply click anywhere within the window to bring up the UI control panel, and select one of the splitter options. The left/right one will create a vertical divider, while the top/bottom one will create a horizontal one.
You can opt for a single left/right splitter and two top/bottom ones to create a unified left column and three other panes for displaying your music library, album cover flow, and some neat visualizations.