Zoom Pinch feature to enlarge stage and hide menu vice versa

I am very curious about how to enlarge the stage and hide the menu and vice versa. I know it can be done because I am reviewing someone's course they created in storyline 2 on my iPad. When I zoom (take two closed fingers and separate) the stage enlarges to fill iPad screen with only the stage and hides the menu. When I pinch screen it goes back to menu and stage. So exciting! When I asked the developer how they did this or enabled it... They were clueless and did not know it did that. I really need this feature. Can someone please tell me how to enable this? Thank you- Stacie

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