If the dashboard user want to set off day for employees after publishing the schedule, they can set in publish mode.

1). Click on 'Attendance' and choose 'Scheduler'.

2). Click on 'Publish' and click on 3 droplets  which are beside of the attendance time you want to set off day. Click on 'Mark as off day'.

3). Then, 'Success' message will show up.

You can see the details in the following video also.