activating full width templates on custom post pages

I think this topic was covered in a fairly recent post but the comments have been closed. I am trying to enable the full width elementor templates on a custom post type called “portfolios”. You responded:
“For custom post types you’ll need to copy the files from the sample-post-templates folder and paste them into your child theme. They’ll need to have the custom post type name declared in the template header.

An example would be: Template Post Type: post, elementor_library – here we are including the template on posts as well as the Elementor My LIbrary post type.”

I wasn’t clear on where these files would be copied to, ie. what folder? sorry if iti seems obvious

The page I need help with: [log in to see the link]