I just recognized, that 2 of my 10 VMs in XenCenter have a slightly different properties window. In these two VMs I cannot set OS boot parameters, because in the window I can only set the boot order. So I have attached two screenshots from the different windows. Are these different types of VMs and how can I change them?
PS: The 2 VMs with this missing field also do not allow me to past something in the virtual console.