In the character selector my characters are too big. Is there anyway to make them smaller without having to change their actual dimensions?
Import the actual needed size of your character lets say if you import character with dimention 500x500 and than scale it down to 100x100 in buildbox than in will show the Actual size which was 500x500. So better is replace your character with the size needed else there is no way to scale it down in character selector screen.
