Yup; this can be done through Page Settings , by changing the the Grid Size. For a square grid, the Grid Size input scales the default dimensions (70px) of each square by a numerical factor (1 by default). For example, if you wanted to have each square in the grid have a length of 100px, you could input 1.4286 as your Grid Size, as 100px ≈ 70px * 1.4286
