There are two ways to exclude secret hotels.
Approach 1: Check Exclude Secret Hotel on the input panel and then click on the Search Hotels button. This will remove all secret hotels from the result list.
Approach 2: Define a new preference on the Control panel: select Booking Type category, select Regular booking attribute, and then check the Must Have box. Sometimes, you may want to keep secret hotels offered by one company. For example, if you want to keep Priceline secret hotels, you can add another preference: select Booking Type category, select Priceline Express Deal attribute, and then check the Must Have box.