New feature has been added to allow you to change multiple day types in the calendar. 

Main menu>>calendar 

Select the ellipses and choose change day type.

The following window will pop up, choose your options that you wish to change from and to and set the dates> save 

The following warning will appear> select change day type if you wish to make the changes. 

Your notification bell will count to 3 then refresh your screen of the changes.

You can also download or view the results from the notification bell of the changes.