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Log into the Builder
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Locate and click the collection you wish to add the modular display to
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In the right-sided tab bar, select Content (Mixed) in the Display dropdown menu
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Add collections and items inside this collection to populate it with your content
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Then, set the Display for this content to multiple displays
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Click Save and Publish to preview to test your new app changes. Then, once your changes are ready to go live to all users click Publish to live apps
note: when using this display type for a collection, single content items must be contained inside a sub-collection or they will not be displayed within the app