Hide/reveal scrolling panel

Hey all! Brand new eLearning designer here. I'm working on an activity where the learner practices writing something they need to memorize and then the correct version appears once they hit a button. I'm having trouble figuring that out. So it's text entry then scrolling panel side-by-side, but I want only text entry to appear at first. I'm already working on a layer as this is one of 3 "practice" tips and tricks for the learner. Can I create a trigger that hides the scrolling panel until the learner clicks the button? Thanks! 

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