If you need to stop all bookings (online and manual) from being entered for a period of time, you can do this using the block booking feature. 

  1. Enter a booking for the start date in your top calendar line.

  2. Change the status to Blocked.

  3. Select Open Group.

  4. Select Add Rooms.

  5. Select the top checkbox to select all rooms and select Save Changes.

  6. The whole property is now blocked for that day. For multiple days, open the group and increase the number of nights.