This top-level menu contains options to adjust the layout of Amarok, and a checkbox to lock the configuration; use this to prevent any accidental changes to the Amarok window layout.
Changing the Amarok Toolbar
There are also two radio buttons in this menu, which are used to choose which Toolbar Amarok will use. The Main Toolbar has a larger height and slightly different controls than the Slim Toolbar. The Main Toolbar contains two main control buttons: a the Toolbar./ button and a button for controlling the volume. It also displays the name of the current media file and a slider for showing, as well as changing, the position of playback. More about
Amarok Window Layouts
If thebutton is unchecked, the Media Sources, Context and Playlist tabs can be toggled and many layouts can be created as shown below: