Yes, you can decide by what day of the week will be used to start your workweek.
However, remember that it impacts some payroll calculations, such as the 52-week average holiday pay.
For example, you schedule your staff from Sunday to Saturday in your retail business and calculate your cost and revenue accordingly.
Go to Profile > settings > shift management
Look for the box called Specify your typical week scheme
Use the dropdown menu on the left to choose the day you want to start your workweek
Scroll down and click on save
In the week view of the rota planner, you can see that your calendar starts on the day previously selected.