You can change between 3D perspective view and traditional orthogonal view, which “flattens” the image. The orthogonal view is useful with 2D PDF files and when elevations (facades) are checked visually. Switching to an orthogonal view can also improve navigation speed when working in large models.
To change the projection, use the Camera Projections tool in the main toolbar:
To view the actual 3D representation of the model, select the perspective view ():
To view a 2D representation of the 3D model, select the orthogonal view ():
You can also use the keyboard shortcut key Ctrl + Shift + O to change between the two views.