This FAQ only applies to the sidebar edition of Acrolinx for Creative Cloud ( InDesign & InCopy ).Acrolinx sometimes checks text that might not be entirely visible on the screen. For example, your document might contain some text that is not in a text frame so you don't see it. Or you might have hidden text that you've stashed off to the side of your document. Sidebar cards are not able to highlight hidden text (although text is on the screen).
We're working on improving this behavior in future releases.