It’s not really about the programming in this case; the thing is, in the demo you can explore large parts of the university—albeit with some rooms blocked off and not much to actually do. However, since it shares the same textures and props, the file size remains almost the same; there’s a lot of cut content, but it barely affects the overall size. Don't worry—we know exactly what we're doing; it just depends on the specific situation. Cheers!