FUNCTIONS Serve per rimuovere colonne da post, page e da custom post type From https://codex.wordpress.org/Plugin_API/Filter_Reference/manage_edit-post_type_columns
function my_columns_filter( $columns ) {
unset($columns['author']);
unset($columns['categories']);
unset($columns['tags']);
unset($columns['comments']);
return $columns;
}
// Filter pages
add_filter( 'manage_edit-page_columns', 'my_columns_filter',10, 1 );
// Filter Posts
add_filter( 'manage_edit-post_columns', 'my_columns_filter',10, 1 );
// Custom Post Type
add_filter( 'manage_edit-CUSTOMPOSTTYPE_columns', 'my_columns_filter',10, 1 );