Head to your employees profile > Contract tab :
Click on “Actions”
Select "Terminate the contract"
Choose the contract end date and the reason
Good to know : If it is a dismissal, you can add the authorization date if the employee is a representative.
If there are shifts or absences scheduled after the end of the contract, you have two options :
Make sure you select the right option as this action is definitive and deleted shifts can't be reinstated !