Options in document search grayed-out

How can I enable the options in document search (cmd-f)?

The question is put very broadly, so I can only guess. Maybe move the cursor to a text field that allows for searching, if that is not the current condition? This dialogue can remain open persistently, and will at times disable itself if you are working in an area where it makes no sense, like the Binder outline (though it will activate itself once you start editing a binder item title).