If I hide the favorites list in the Firefox browser and use the F11 key to hide the browser menu, then I have a full-screen website.

However, I don't want the content of the website to be full screen because the long lines make the text difficult to read.

Are there examples of websites with full screen to understand what exactly is meant.

Dennis, you can easily create a full screen website in WX5 if you limit yourself to only one cell per row on the page and then select extend. This will cause the content to fill the full width of the browser window rather than be limited to the width defined in Step 2, Responsive Design and it will be fully responsive.