The 'input box' is called the 'Tracker'. Besides the Work Environment checkbox for the Tracker which Coy82 mentions, if you have the standard toolbars displayed, you will see a button as in the attached screenshot which turns the tracker on and off. Further, the black triangle to the right of the button gives you options for Tracker input.
Cheers,
Karl
PS You can also assign a shortcut key to the show/hide Tracker command.
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