The canvas is the primary working area where you can place and arrange dashboard assets. The canvas is organized by a grid system. Grid squares are 80 x 80 pixels with a 20-pixel gutter. By default, the dashboard is 10 x 19 squares. To change the dimensions of the dashboard, ensure that you do not have an asset selected, and then select the Canvas expander on the right side of the dashboard.
Change the dashboard to 19 x 10 squares.
Change the dashboard to 25 x 14 squares.
US Letter
Change the dashboard to 10 x 8 squares.
Specify your own width and height.