Where can I define custom logout redirect URL

[ploginov-dataart]

Hi all,
Where can I define custom logout redirect URL used in:
openid-connect-generic-client-wrapper:389

return $url . sprintf( 'id_token_hint=%s&post_logout_redirect_uri=%s', $token_response['id_token'], urlencode( $redirect_url ) );

I want to be able to redirect to custom logout URL.