Include in your dashboard like this:
<div data-id="fullscreen" data-view="Fullscreen"></div>
It doesn't even need to be part of the grid, Dashing will happily initialise it anywhere on your page. It is invisible.
Once added to your page, Hit 'f' to enter fullscreen.
You can also install this across all your dashboards by adding the widget to the
dashboards/layout.erb
. Example: