If you ever need to update a specific day on your calendar, instead of changing your set recurring schedule you can do this directly from your Appointment Calendar:
Open your Appointment Calendar and you'll find a gear icon at the top right corner of the screen. This is what you can use to edit your schedule on the fly or adjust one day in particular!
Click on the gear icon in the upper right to adjust the start/end time of your days—then click directly on the time to select when your start or end time will be. Toggle the day to purple if you're in, and toggle it to grey if you're fully out.
Hitting save will immediately adjust your work schedule for only those days you have edited.
It's important to note that any changes you make directly on the calendar in this way will override your recurring schedule, which was set up under Settings. This means that if you close out a weekend for your birthday, and then later specify within your recurring schedule that you work Saturdays, your birthday weekend will still be marked as "out."
If you are instead needing to change up your recurring availability, not only specific days, this article will get you there.