If you don't want the employee to see the disciplinary section under employment you will have to remove permission for an employee to see the disciplinary section, the permission that needs removed is named HR_Disciplinary, to do this, follow the below steps:
Find the employee using the organisation search then open their profile.
Drop-down Permissions.
In the top right, click Edit and search for the permission called HR_Disciplinary.
Remove this permission.
This will revoke access to that section of employment.
📌Note: If you remove it from a post or role, all employees that have this role or post will have this removed, make sure you run a batch update, so these changes reflect on the system. No strikethrough for permissions means enabled, strikethrough means disabled.