Set the first day of the week

You can choose to set either Sunday or Monday as the first day of the week. Setting this will affect the calendar seen when adding or modifying due and scheduled dates, as well as how items are grouped in the Scheduled list and Logbook. To set your choice:

DESKTOP / MOBILE

Using the web app, press hotkey comma , or access your settings and select Preferences. In the panel that appears, under Calendar Week, choose Sunday or Monday.