once you add the roof system is there a way to hid it in the 3d model so you can view the floor layout without the roof being in the way?
Look in the Navigation Pane on the left of the screen. One of the categories is "Presentation Views". Open one of the views and you will have a 3D view looking down on the house without the roof.
Another option would be to assign the roof to a Building Option and turn the Building Option off to temporarily remove the roof.
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