Width issue on ONE page / flatiron

Hello :). Our studio site is www.tsulibros.com.

We're using the flatiron template, which usually has a fixed width (as you can see here, for example https://www.tsulibros.com/#/juan-munoz/); the content fills about 3/4 of the page, leaving a blank space on its right.

I'd like to create a new page and bypass that content limit area, allowing me to fill the whole page, but only in this specific instance (I don't want to apply this change to the rest of the pages, just the one): 

I was wondering if this is something that could be fixed using code ? I'm a bit clueless. 

Thank you in advance! :).

I think you can't remove that message from edit mode, but you can use this code to Website > Website Tools > Custom CSS to force page fullwidth on live mode.

section#container {
    max-width: 100% !important;
}