From the Home Board:
Simply click or hover on the scheduled icon under a students profile image to access the sign out option.
This will prompt their leave form, at the bottom of the leave form click Sign out. This will sign the student out on their leave and remove them from the "Upcoming Leave" page.
In the Upcoming Leave page, tap on the information icon
This will prompt their leave form, at the bottom of the leave form tap on "Sign out".
Tap 'Confirm' to complete sign out