Now sorted. My problem was all the support topics are saying you should alter the page.php file to disable a side bar on an individual page.in my case it was the content-page.php which was the one to alter using
<?php if (is_page(‘223’)) : ?>
<?php else : ?>
<?php get_sidebar(); ?>
<?php endif; ?>
Adding a new div id on the page.php and some css sorted the 100% width of the page.
Thanks for the reply, this theme hasnt any custom templates to select but you can disable the sidebars which doesnt help the 100% width.
There is lot of topics on this ie, if page id, and css display none, but no joy so far.
my themes get sidebar is on content-page.php not page.php so this is causing confusion for me…