When you embed the Bookeo widget in your website, it is necessary to tell Bookeo the address of the web page where you have embedded the widget. This is called the "default" widget page.
When customers click on links to review their booking, leave a feedback etc, Bookeo will redirect them to your default widget page, which means that customers will be able to complete the operation in your website, instead of Bookeo's.
Remember you can still embed the widget in as many pages as you want, even on different websites. But you can only have one "default" widget page, because Bookeo needs to know where to direct your customers at all times.