<https://www.elegantthemes.com/forum/viewtopic.php?f=22&t=657295>

If you use a fullwidth post title on post, it's actually full width. If you use it on pages, it's not full width. To fix this:

This in the CSS class field of the fullwidth post title module:

hws_fwh

This CSS in the Divi theme options:

/* -- FIX make fullwidth header fullwidth on pages -- */
.hws_fwh .et_pb_title_featured_container {
width:100%;
max-width:100%
}
/* -- END make fullwidth header fullwidth on pages -- */
Code language: CSS (css)