Catch Box: Where to find Disable Sidebar Template

I have tired to find out how to disable sidebar in Catch box theme.

I can see different discussions about “Disable Sidebar Template “, but can’t seem to find it.

Disscussions about it includes:
http://wordpress.org/support/topic/theme-catch-box-disable-sidebar-template-not-full-width?replies=17

Where can I find the template?

Thanks