You can stop employees from applying for individual leave types and reasons or from all leave types.
Individual Leave type or reason
To hide a leave type or reason in ESS so that employees are unable to select the leave reason when applying for leave or to see the leave balance:
Go to Settings, Leave.
Locate the Leave Type or Leave Reason.
Edit (square button with a pencil) the Leave type.
To hide the balance, untick Display Balance.
To hide the Leave Reason, untick it.
Click Save.
All leave types
To stop employees from applying for any leave
Go to Settings, Roles & Permissions.
Select the Member role.
Click Edit.
Under Leave, click the icon to change permissions. Select either:
Deny (red circle with a diagonal line), they won't see leave.
View (blue circle with an eye), they will be able to see leave but not apply for it.
Click Save at the top of the screen.
Repeat the above steps for each member role if you have more than one and you want to block leave for all employees.