From Booking Automation Wiki
Set whether properties that do not have a price for the specified booking condition are shown at the bottom of the property list or not shown.
- Sell Priority will display the properties in the order selected in SETTINGS -> BOOKING PAGE -> PROPERTIES -> MULTIPLE PROPERTIES -> PROPERTY SETTINGS.
- Unavailable at bottom will display properties which are not available at the bottom.
- Hide Unavailable will not display properties which are not available.
- Hide Unavailable or no match will not display properties which are not available or do not fulfill the search criteria the guest selected.
NOTE: If you have less than 50 properties in the account the system will check if all selected criteria are fulfilled. For accounts with more then 50 properties for performance reasons the system will only check if any rooms are available for the selected dates.