For those columns to appear, it requires libksysguard to be build with libpcap which is a recommended dependency CMakeLists.txt · master · Plasma / libksysguard · GitLab.
In order for it to correctly work the program needs special privileges CAP_NET_RAW. We try to set it in the build process via libcap and/or the distro needs to handle it specially processcore/plugins/network/helper/CMakeLists.txt · master · Plasma / libksysguard · GitLab