Portfolio Items on click navigagte to external website

open that single portfolio – there is an option to show “Additional Portfolio Settings”

if you like to open all external links in a new tab/window – put this to your child-theme functions.php

function open_external_links_in_newtab(){
?>
<script type="text/javascript">
(function($) {
  var url = window.location.origin;
  $('a').not('a[href*="'+url+'"], a[href*="mailto:"], a[href*="#"], a[href*="tel:"], a[href*="javascript:;"] ').attr({
    'target':'_blank',
    'rel': 'nofollow noreferrer',
  })
})(jQuery);
</script>
<?php
}
add_action('wp_footer', 'open_external_links_in_newtab');