How can I modify the aperture of an opening?

There are two properties to take into account for this purpose: the Max Aperture (%) and the Aperture (%). Both of them can be found in the Properties Panel, inside the Opening tab:
  • The Max Aperture (%) is only displayed in 2D in Top View when the Cut Plane is activated. It allows you to show the maximum aperture an opening can have.
  • The Aperture (%) is used to choose how opened the 3D display of a door or window is.