That's probably what people are most interested in, if they've opened the System Monitor in the first place.
A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-systemmonitor/-/merge_requests/117
Git commit adec273b2ee2898da4a8382e2badfce3c766c7fa by David Edmundson, on behalf of Felipe Kinoshita. Committed on 23/04/2021 at 14:08. Pushed by davidedmundson into branch 'master'. Sort by CPU Usage by Default This applies for both the inline applications table on Overview page and the Applications page itself. M +2 -2 src/faces/applicationstable/contents/config/main.xml https://invent.kde.org/plasma/plasma-systemmonitor/commit/adec273b2ee2898da4a8382e2badfce3c766c7fa