Hi @lindagester,
There is no such feature currently.
If you are comfortable using the code, you can use add the following code in function.php
file of your current theme.
function user_registration_modify_display_name( $form_data, $form_id, $user_id ) {
$display_name = '';
if ( isset( $form_data['first_name'] ) ) {
$display_name .= $form_data['first_name']->value;
}
if ( isset( $form_data['last_name'] ) ) {
$display_name .= ' ' . $form_data['last_name']->value;
}
$userdata = array(
'ID' => $user_id,
'display_name' => $display_name,
);
wp_update_user( $userdata );
}
add_action( 'user_registration_after_register_user_action', 'user_registration_modify_display_name', 9, 3 );
Thanks & Regards.