KDE Plasma 5.21.3 comes just two weeks after KDE Plasma 5.21.2 and it’s here to improve the new Plasma System Monitor app that will finally replace the old KSysGuard system monitor app by default in the upcoming KDE Plasma 5.22 release, due out on June 8th, 2021.
These improvements in the new Plasma System Monitor app enable you to move a widget within a page, enable the app to remember its filter text when switching away from the filtered view and then go back, and make the text in table columns to always properly align vertically with all fonts.