How I can resize the tiles size on the home screen of Nokia lumia phones to a different size?

Now  you can easily re size the tile size of home screen on windows phone 7.8 and 8 .Just click on the tile and hold it for a second or two and then click on the arrow icon. Depending on the app, the tile can be of two or three different sizes. When you are ready, click the screen. You also readjust tiles. Click and hold a tile, drag and drop it to the new location, and click the screen