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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 - Saved Plan Views, Layers & Annotations
4 - Understanding Layers
904 - Controlling What Displays in 3D
5302 - Active Layer Display Options Side Window
5483 - Understanding Layer Sets
362 - Showing an As-built Mask on a Remodel Plan
5224 - Reference Display Drawing Order
5435 - Using the Reference Display
2421 - Saved Plan Views
10 - Annotation Set Basics
1934 - Using Annotation Sets to be more Productive