Adaptive Theme: give the option to user to switch between fluid and fixed layout in specific nodes
Assuming that you did not heavily modify the base structure of Adaptive Theme, you can explore using a custom solution to do this.

For example you can add a button like this in a block's contents (using the Raw HTML input format):

&lt;button id="toggle-width"&gt;Toggle Width&lt;/button&gt;


then a new class in your CSS to override the max-width property in .container (this is where the max-width is set in Adaptive Theme):

.page-full-width { max-width: none !important; }


and then add some jQuery to your button:

$( "button#toggle-width" ).click(function() {
  $( "#page" ).toggleClass( "page-full-width" );
});