Here we go through a situation where a holiday has been cancelled or postponed, for example, due to sick leave.
If your vacation needs to be postponed due to sick leave, or if you have accidentally marked the wrong days in your vacation, the account administrator can restore the vacation days or transfer them to different days like this.
Reports → Holidays and absences → Select the days in blue where you can see the holiday entry.

In this view, a list of vacation days marked by the employee opens, select it to open the shift.

In the view that opens, you can either move the date, change the hours or type, or use the trash can icon to delete the entry and return the employee's vacation day to apply for again.
