[@robkk Moderator 11 years, 1 month ago]

Add this to your functions.php file in your child theme or functionality plugin to remove the display name changer in bbPress and also WordPress.

add_action('show_user_profile', 'remove_display_name');
add_action('edit_user_profile', 'remove_display_name');

function remove_display_name($user) { 
    
    if ( bbp_is_single_user_edit() ) {   
        ?>
        	<script>
        		jQuery(document).ready(function() {
        			jQuery('#display_name').parent().hide();
        		});
        	</script>
        <?php 
        
    } else {
        ?>
        	<script>
        		jQuery(document).ready(function() {
        			jQuery('#display_name').parent().parent().hide();
        		});
        	</script>
        <?php }
        
}