The unavailability function allows you or the employees themselves to set them as unavailable for certain time periods.
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You can mark people as unavailable for the days when they are not free to work - the unavailable days will be displayed on the Schedule Calendar in a light grey colour.
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To add an unavailability simply right-click on a person's row and choose 'Mark as unavailable'. Next, a window will open where you can enter either a single period unavailability or select multiple days when the person will be unavailable.

Important: If a person is unavailable it won't be possible to assign shifts to them for that period.

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