No full screen at all

Hello guys, no offense but something I can do with drupal in 2 sec, seems impossible on WP and I thought this plug-in would do it.

I need to hide the widget on some pages… Display Widget can do that. But all I have left is a page with no widget and a lot of wasted space. Not a full page, like you would in Drupal if you had no blocks on the page.

How can I get a full page for some pages and widgets on the side for others?

Thanks
Mario

http://wordpress.org/plugins/display-widgets/