on 03/15/21 at 14:54
Hi.
1. Find the file in the directory \app\View\Elements\user\header_profile.ctp
2. Open the file: header_profile.ctp
3. Delete or comment out: <li><span class="date"><?php echo __('Born on')?>:</span> <?php echo $this->Time->format($user['User']['birthday'], '%B %d', false, 'UTC')?></li>
4. Clear cache
Good luck!