Here’s the clean, step-by-step way to set non-working days in Microsoft Project:
- Open your project in Microsoft Project and navigate to the 'Project' tab.
- In the 'Project' tab, click 'Change Working time'.
- Click the 'Work Weeks' tab.
- Select 'Default' and click 'Details'.
- Select the day(s) you want to set as non working days.
- To enable it, choose 'Set days to nonworking time'.
- Set the start and finish time.
- Click 'OK' to save the changes.



