Considering different risks we highly advice to disable Delete Order and Remove Item buttons and use Refund Order and Refund Item buttons instead.
To disable Remove Item button:
To disable Delete Order button:
(For each role hide selection from Show Delete Order button option then press Save button).
Restart the program.
Now Delete Order/Delete Orders and Remove Item buttons will be hidden.
If you still need to show Remove Item button for administrators: check Only admins may remove item option on menu Configuration – Preferences – Order – Item buttons.
The same for Delete Order button: it may be visible for administrators by checking the option: only admins may delete order. This option is located on menu Configuration – Preferences – Orders. Note: Show Delete Order button option must be also checked. But it will be visible only for administrators.