CakeHR does not allow you to delete active employees as we want to avoid any accidental data loss. 

In order to delete employee, you first have to "terminate" it. To do that, go to employee's profile & at the bottom of the page click on the red "TERMINATE" button.
When terminated, you will be taken to "Terminated employees" report (it's under "Reports > Employee data > Terminated employees") & from there you can click on "delete" icon next to each terminated employee.

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