To block out a section of time on an appointment calendar, first check that you're viewing the correct calendar.
If its the venue you need to block out, select the venue. If its a specific staff members calendar choose staff > then choose their name.
How to schedule a time block
Time blocks are created by clicking any open white space > selecting 'Time block' in the top right > filling in the prompts.
How to tell if a time block is scheduled to all boards or not
After a time block has been created, you can distinguish between the two different types of time blocks using these two icons.
A time block booked to all boards shows a crossed out sign.
A block booked to a specific board shows a board icon.
Schedule a Recurring time block
Time blocks can also be set to recur if you know of a teacher's upcoming schedule.
Just set the recurring date / time & the date it ends on. After saving, you'll see a confirmation message.
Editing / deleting an individual time block
This can be done by clicking time block in question.
Editing a whole series requires deletion / rescheduling
Note that if you are editing an existing time block this will only allow you to edit an individual block, not a series.
If you're goal is to edit a whole series, you'll have the option to delete a whole series and reschedule it.