To see the 'Unavailability Report' go to the tab 'Reports' -> and under 'Employee' -> 'Unavailability'. Here you can view your 'Unavailability' by day during a certain date range. The 'Total' shows total percentage and hours for which someone is not unavailable during the selected date range.
At the top, you have date range filters as well can filter the report by 'Positions', 'Employees' and by 'Skills'. You can also sort by the 'Employee Name' and by the 'Employee Start Date'.
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