If you have set up several different calendars  and want to make sure that a specific one is used for the availability search, e.g. because it has a colour customisation, which should be used for the availability search, use the steps below.

1. Go to Admin > Website integration > tab Calendar wizard
2. Check the Selected site ID.
   (this is only relevant when you have more than one)
3. Click Edit to the right of the calendar with the correct siteID.
4. Scroll to the bottom of the page.
5. Click the option Set as default calendar for availability search.
6. Make sure to save the change.