Calendar Time Off button no longer available?

Hi!

I used to be able to add Time Off on the calendar by opening the calendar, selecting a date, and clicking "Time Off".

Now when I go to the calendar, there is no Time Off button. I am given the option to add a new calendar event, but it appears to be based on the list of services. I don't want to add a service and have my coworker think he has something scheduled on his day off, and I don't want to sync his availability with outlook.

How can I get the time off button back on my booking page?