View Preset > Top Planar View (3D Menu)

Use this command to switch the current 3D space's view to a top planar view.

Changes to the view (i.e. the position and representation of the 3D space relative to the 2D world) cannot be undone using normal Undo, but only using 3D > View Preset > Undo. Alternatively, you can save one view in each room using 3D > View Preset > Save Current View and restore it later using 3D > View Preset > Retrieve Saved View.