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Turning on the Reference Display allows you to see objects on a floor below or above the one you are working on.
20 - Layers & Annotation Sets
4 - Understanding Layers
362 - Showing an As-built's Mask on a Remodel Plan
363 - Coordinating Layers to Show Existing, Demo and New
365 - Coordinating Layers and Room Definition to Show Demolition Walls
366 - Developing 3D Views of the Remodel Components
904 - Controlling What Displays in 3D
5224 - Reference Display Drawing Order
5302 - Active Layer Display Options Side Window
5435 - Using the Reference Display Layer Set
5483 - Working with Layers and Layer Sets
2421 - Saved Plan Views
1934 - Using Annotation Sets to be more Productive
600 - Using Layer sets to control dimension size, text size & color