If non-working days are not greyed out on your Gantt Chart when working with Microsoft Project, right-click over the Timescale and from the shortcut menu, click Timescale. Select the Non-working time tab.
Select Behind task bars in the Draw section. From the Color dropdown, select an appropriate colour. If you are using a calendar other than the Standard calendar, select it from the Calendar dropdown. Click OK. Your non-working days will now be visible on your Gantt chart.
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