If you’re going on vacation or leave and want to disable check-in prompts while you’re away, go to Preferences - Planned Absences and click on the days when you won’t be checking in.

You also have the option to check in as “Absent” when you receive your check-in reminder.

Administrators can set user's absences on their behalf by selecting "Edit" from the menu next to the user and scrolling to the bottom of the page.

Select the days the person will be absent and "Save changes" when done.