Programmatically get the results of a view
You can not get the value of field directly from row result.
You can get it by accessing to the entity like the following:
Option1    

  foreach ($view-&gt;result as $id =&gt; $result) {
    $node = $result-&gt;_entity;
    // Get the full name value.
    $name = $node-&gt;get('field_user_full_name')-&gt;value;
    // check the result output for testing only.
    \Drupal::messenger()-&gt;addMessage(t($name));
  }


Or by loop through the fields like the following:
Option2:  

foreach ($view-&gt;result as $id =&gt; $row) {
      foreach ($view-&gt;field as $fid =&gt; $field) {
        if ($fid == 'field_user_full_name') {
          //Get the full name value.
          $name = $field-&gt;getValue($row);
          // check the result output for testing only.
          \Drupal::messenger()-&gt;addMessage(t($name));
        }
      }
    }