FreeCAD: Scene doesn't look 3D
FreeCAD, like many other 3D programs (including blender) does use Isometric/Orthographic display as the default displaying option as it allows to see on one view if some lengths or angles are "equal".

In many cases, a perspective view can be toggled on to allow visualization in a room, especially for architectural one.

In the case of FreeCAD with all its options, this option gets swamped out of the user's field of view sometimes, and the documentation is not that easy to navigate without a proper keyword, making the right thing slightly hidden in the documentation. But once you know it, it should be obvious: 


View &gt; Perspective View toggles to perspective view.
View &gt; Orthographic View toggles back to isometric.