To change the cycle for one or multiple days in Yearly View from Team Manager, go to Operations - Team Manager, right-click on an employee cell and click View timecard.
Accessing the Timecard of an employee in Astrow Web
This will open the timecard of the person. Select a cell and click Change cycle (or right-click - Change cycle):
Changing the day program for multiple days in Team Manager - Timecard in Astrow Web