Try this (It’s not a short code, but it’s code that should work to achieve your goal until a qualified developer replies):
Within a text block, you can insert this code to get a full-width divider:
[divider type="thin" text="Go to top" full_width="yes" width="1/1" el_position="first last"]
This is only to be used with no sidebars, and with Standard/Thin/Dotted divider types.
So you can replace divider type=”thin” with divider type=”standard” or divider type=”dotted” as long as you don’t have a sidebar on the page.
Maybe that will do the trick?
Cheers!