This article explains how to set a day off for a staff member.
Note: If you would like to set multiple days off for a staff member or multiple staff members, go to: Set Days off for Multiple Staff Members at Once
There are two ways to set a day off for a Staff Member:
With the Calendar on “Day View”, select the staff member and hit Set to Not Working.
On the pop-up window, use the OK button to save.
Go to: Settings > Staff Members
Select the Staff Member and go to the Work Hours screen.
Use the Edit button and select This Day Only.
Enable the toggle for "Not Working" and select a reason. Save.