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.
- Enter a booking for the start date in your top calendar line.
- Change the status to Blocked.
- Select Open Group.
- Select Add Rooms.
- Select the top checkbox to select all rooms and select Save Changes.
- The whole property is now blocked for that day. For multiple days, open the group and increase the number of nights.