Go to Settings --> Users & Companies --> Users --> Enable POS Order Delete. To give permission to the user to delete the paid POS orders.

Go to Point of Sale --> Configuration --> Settings --> Enable the boolean field Delete Paid Order.

Choose with or without code, Enter a code if your going with code.

Go to Point of Sale --> Orders --> Orders --> Choose Order/Orders to delete --> Select the action 'Delete Paid Order'.

Enter The Code and Click on 'Delete Paid Order'.

Enter The Code and Click on 'Delete Paid Order'.

Shows a Confirmation Wizard if Your Going Without Code.