how to disable the theme gallery on a custom post type page

Hi, dear theme author,

how to disable the theme gallery on a custom post type page (in this case “advert”)?

When zoomed on mobile, the theme gallery default open once, how to close it?

There is existing code i found below but it does not work:

add_filter(‘ocean_meta_viewport’, ‘owp_child_viewport’);
function owp_child_viewport( $viewport ){
$viewport = ‘<meta name=”viewport” content=”width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0″>’;
return $viewport;
}

Thank you in advance for helping!

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