Specify times that staff are on leave, this will be displayed on the Dispatch Board Calendar and Staff Schedule.
The Staff Leave add-on is a straightforward option to block out dates in the schedule when a team member is on personal leave or vacation.
Periods of leave can be added against a staff member in Settings > Staff, which will block out the team member's availability in the Online Dashboard.
Note that while ServiceM8 will display staff leave, it won't prevent you from manually scheduling a job to a team member during these times.