As the owner of the organization, you have the ability to set which day of the week your workweek starts on.
First, click on Settings & Policies from the main navigation menu (1). Select the General tab from the drop-down tab that appears (2).
Scroll down to the section labeled START WEEK ON*, and click on the field below.
Select the relevant day from the drop-down menu that appears. The selection you make here will become the new start of your organization’s workweek.
Click Save at the bottom of the page to confirm the changes made.