Featured Image on a page displaying full-width

Hi there,

I want to use the Featured Image option on a page to create a 'full width header'.
I don't want the content to be full width.

On the homepage (www.dweildag.nl) it worked for me by adding a 'container' in the editor.
I'm trying to achieve the same result (a full width image) on other pages like https://www.dweildag.nl/organisatie/contact/

Can you help me out?