Currently, start day for the week and the work-week are set based on your language in Settings in Microsoft Teams. The Calendar team has work on the backlog to address the case where users may want a different week/work-week start day than is usual for their language setting.
Until then, the team wanted to share this workaround for setting the work-week start day via OWA, while leaving your language settings as-is.
- Open Outlook Web Access (“OWA”), and go to the Settings panel, as described in this article: https://support.microsoft.com/office/calendar-settings-in-outlook-web-app-84544ef2-d5cf-4696-bcb3-cc87719a3e07.
- In the OWA Settings, click “View all Outlook Settings”
- Use the settings under “Show work week as” to choose your work-week days.
- Click “Save”
- Return to Teams, click on your photo/initials at the top right and choose “Sign Out”
An error occurred while saving the commentMarush Denchev commented
The lack of a setting like this one is why nobody really wants to use Microsoft Teams. If it wasn't part of Microsoft Office 365 nobody would have chosen it to be their tool for daily team interactions.