Specifying dashboard size
By default, the automatic size of 100% of the screen for dashboard width and height is selected. You can also set maximum width and height in pixels. Alternatively, you can set the exact dashboard dimensions in pixels.
If you specify a dashboard size that is smaller than the screen size, the remaining space creates a border at the sides and the bottom of the dashboard.
Note: If Auto-hide toolbar is selected, the height of the dashboard increases by the height
of the toolbar.
See Auto-hide toolbar.
To change the dashboard size: