I wanna full width my forum
so this what I see on page
no full width
That depends on the current active theme. Most of the themes have a Full-Width template when you're adding or editing a page:
This doesn't have any relation to wpForo, this is a theme page layout issue. I see your theme doesn't have full width layout. If you don't have full width page template you should ask theme developers to create one for you, that's not so hard.
Also if you built this page with a visual composer make sure you've set the content wrapper with 1 column as far as I see this is 2 or 3 column layout.
thank you for help
I am using jarida Theme so Full Width from setting on theme not on plugin
and it is done now