page / portfolio tagline images – make parallax?

Hi, just bought the theme and very impressed so far.

I have a question though,
in the theme options, I can set a default background image or remove.
This then shows as default ‘parallax’ image behind tagline area of each page / portfolio.

However, if I add a featured image, and in page edit select to show the featured image behind tagline area rather than default image, it shows as a smaller (limmited height) fixed image and not as full width parallax as the defualt image shows.

Is there a way to be able to set featured image so it displays this way, as full width and parallax, but defined on each page/portfolio?

Thanks