To the left of the Command Window, there are 2 tabs for the Current Directory Window and Workspace Window. If the Current Directory tab is selected, the files stored in that directory are displayed. The Command History Window represents commands that have been entered, not just in the present session (in the present Command Window), but formerly as well. This default configuration can be changed by clicking the Desktop, or using the icons at the top-right corner of each window: either an 'x', which will close that specific window; or a curled arrow, that in its starting state pointing to the upper right lets you undock that window. Once it is undocked, clicking the curled arrow pointing to the lower right will dock the window again.