Created attachment 138672 [details] Windowed plasma-systemmonitor I noticed this in plasma-systemmonitor History tab, CPU graph. For me, when the app is fullscreen, the legend items say "Usage", but when in windowed mode, with less horizontal space, it splits the items onto multiple rows, dedicating more horizontal space per-item, resulting in them displaying in their longer format "Core # Total Usage". Not sure if this is a real bug, but it seems weird to me.
Created attachment 138673 [details] Fullscreen plasma-systemmonitor
Individual Core Usage system monitor widget placed on desktop behaves in the same way on Plasma 5.22 beta. Sensors labels change from "Core # Total Usage" to just "Usage" depending on widget width.