In Ksysguard's Processes view there are the right-click options "Set Priority...", "Jump to Parent Process", "Show Application Window" and "Detailed Memory Information". These are all missing from the new plasma-systemmonitor's Processes view.
*** Bug 441040 has been marked as a duplicate of this bug. ***
Same problem even in KDE Plasma Version: 6.0.2 KDE Frameworks Version: 6.0.0