The Starting Day of Work can be changed in the Global Settings - System Settings.
Navigate to Menu > Settings > General > Global > System Settings - Starting Day of Work.
Warning: Changing this after you have already started to use the system will:
- Timesheet: When an employee clocks on, their timesheet is assigned to a week. By changing this setting, the week the shift is assigned to will change.
- Solution: Click Edit and then Update on every shift in the timesheet. This will reassign the shift to the correct week.
- Period will change: All the payment periods for all payslips, past and future, will change.
- See this FAQ on changing "Transitioning to a New Pay Cycle".