Use Exceptions for specific dates to make changes to your general week, for instance for Holiday
How to find
Go to Working Hours page and scroll to the very bottom.
Let's add exceptions for Christmas time. December 25 will be holiday and December 24 will be short working date.
1. Click Add Exception
2. In appeared pop-up select Exception date - 2019-12-24 and Work interval from 08:00 till 13:00. This is going to be our short working date. And click "Add Exception"
3. Now add December 25 as Holiday day. Switch toggle at the top of pop-up to position "Closed" and click "Add Exception".
4. Observe list of exceptions in the grid: