How to Change Non Working Days in Microsoft Project

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Here’s how to change non-working days in Microsoft Project: 

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1. Let's start by opening your Microsoft Project file and clicking on the 'Project' tab in the ribbon at the top of your screen.
2. Now, look for the 'Change Working Time' button in the 'Properties' group of the 'Project' tab and click on it.
3. In the 'Change Working Time' dialog box, click on the 'Work Weeks' tab to modify your work schedule.
4. Select the 'Default' work week and click the 'Details...' button on the right.
5. In the details dialog, select the specific day(s) you want to mark as non-working days. You can select multiple days by holding Ctrl while clicking.
6. With your day(s) selected, choose the 'Set days to nonworking time' option. 
7. Click 'OK' to close the Details dialog, then click 'OK' again to close the Change Working Time dialog and apply your changes to the project calendar.