Productivity features added in X15 include: Live Materials List, updated Library Browser, Coordinate Axes, Replace Fonts, , merged Open Object and Open Symbol dialogs and more.
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What's New in X15
What's New in X15 - Productivity Features
What's New in X15 - Building Features
What's New in X15 - Design Features
What's New in X15 - Drafting Features
What's New in X15 - Presentation Features