Hi AO,

The Carrara prebuilt scenes were actually created prior to Scene Scale in Carrara was offered. So, by default, the scale is incorrect. The easiest way to fix this is just as Brian indicates, grab the scale handles or change the numeric settings. 

While you can change the scene magnitude in the scene settings after a file is open, all that does for you in change how the atmospherics interact with the scene. It won't have any effect on placing/importing figures. :-/

Mark