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I use the invisible style, under Style>Format, in Nisus Writer 6.5 when writing quizzes and exams for my classes. This allows me to hide the answers with the questions. Express doesn't offer this feature. Is there a way to accomplish this in Express?

Sorry, but Express doesn't have invisible text. What I'd probably do is define a character style, call it "Answer" or "Invisible", and set the text color to white (or whatever your background color is).