Design features added in X13 include reveal control of right and left sides of cabinets, control of cabinet face item overlap, dimension to cabinet face items, and extended stiles.
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What's New in X13 - Full List
What's New in X13 - Building Construction
What's New in X13 - Design
What's New in X13 - Drafting & Project Management
What's New in X13 - Presentation
What's New in X13 - Productivity