Step-by-step guide:
1. Go to your dashboard and click on the Edit button (pencil icon) to adjust your global settings.
2. Go to Booking Rules in the menu on the left side of the page
...
3. Scroll to Blackout Dates and set the date range(s) that you would like to block from being available to make reservations. You can add multiple date ranges at once by clicking on "Add Another Item".
...
