A list is composed of items from the display of search results, that is, from the broad middle column on the screen. The management of the list is conducted via the smaller window on the right-hand column of the screen ("Managing Lists").
By using the controls in this column you are able, for example, to display the items of your list in the broad central column on the screen; just click on the "display list" button. In this case, the table of search results will no longer be visible, though it may always be returned to. You see "Your List". You may also use the controls in the column to download lists to your computer.
The column on the right will also display the number of titles contained in the current list.