The Show Clip Cube is one of the quick preferences that you can activate on the toolbar. It is ideal for creating a three-dimensional clip from your design, allowing you to focus on part of the design.
In this view you can see the entire building, which makes it hard to work on just the stair.
In this view the Show Clip Cube preference has been activated which will filter out all the rest of the building making it easy for you to see the stair.
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