Pls modify the below code lines starting at line no:23 in file framework/functions/portfolio-functions.php from
$query_args = array(
'post_type' => 'portfolio',
'posts_per_page' => $args['posts_per_page'],
'paged' => $paged,
'orderby' => 'menu_order',
'order' => 'ASC'
);
to
$query_args = array(
'post_type' => 'portfolio',
'posts_per_page' => $args['posts_per_page'],
'paged' => $paged,
'orderby' => 'menu_order',
'order' => 'ASC',
'post__not_in' => array( 153 )
);
You need to specify the post id of the item that you want to hide as the value of post_not_in parameter .