If the Term Works! screen covers up too much of the underlying text (or you simply want to see the text that has been selected), click the <Show Text> button. The TermWorks! screen expands and displays the highlighted text in a box to the right. See image below.
Whenever you change the scope of the highlighting, the text shown at the right will also change. (Note: You cannot edit text in this box. You can only do that within the actual document.)