The most recent designs are using even more full width areas to show everything. Sometime the background color is full width but the content is boxed and limited to a standard width, and sometimes the content is as large as the page (example for a slideshow). You can do all that with Page Builder CK.
This article will explain you how to do that, but it will especially explain you that the "fullwidth" design is also related to your template. Of Couse Page Builder CK is fully compatible with Template Creator CK.
On each row (of first level) you can choose how do you want it to be :
- Fullwidth (by default)
- Fixed content width : value by default in the component option, or specific value for each row
- Fixed content width, automatic with the template created with Template Creator CK