Was moving my mansion and it shrunk. How do I get it back to size?

I don't think the mansion can shrink, it is always 4x4 size. But if you accidentally zoomed out, it may appear smaller. To control the zoom on a phone or tablet, pinch in and out with 2 fingers. On a computer, use the scroll wheel between the 2 buttons on the mouse. The zoom method can also be used during hidden object scenes to help see objects and highlight words when items are in the field.