In this section, you can add the holidays you will not be working.
Location: "Settings" - "Store" - "Company Calendar" tab
URL: https://pccomponentes-prod.mirakl.net/mmp/shop/account/business-days?limit=10&sort=date%2CDESC
It is used so that the system automatically calculates the delivery time of an order without you having to modify your shipping settings, thus facilitating your management.
You will not be able to modify working days, but you can edit your holidays.