Why does SU Web color areas differently?

2020-12-02 20_57_24-SketchUp
2020-12-02 20_57_46-SketchUp

Two views of the building I am modeling. SU uses different colors for windows, sections of walls - why is this?

Thank you.

Front vs back sides of faces

The blue indicates that the back side of those faces are exposed. Faces have a front and back. When your model is 3D you should only see white front faces. You can right click on the blue ones and choose Reverse Faces.

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DaveR, thank you so much, truly appreciate your help. Regards.

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