Amarok/Manual/References/MenuAndCommandReference/ViewMenu
View Menu
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.
If you uncheck any of the three panes, you dismiss them from your window. To recover the pane(s), merely check the box.
There are also two radio buttons in this menu. The buttons 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 Play/Pause 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 the Toolbar.
If the Lock Layout button is unchecked, the Media Sources, the Context and the Playlist tabs can be toggled and many layouts can be created as shown below: