Development of the upcoming version of Plasma 5.21 has, among other things, introduced many improvements into Plasma’s design, utilities and themes, with the aim of providing end users with a more pleasant and accessible environment.
Although most things in Plasma 5.21 beta will work fine, please note it is still beta software and released mainly for testing purposes. Using this software in production is NOT recommended.
The final version of Plasma 5.21 will be available on the 16th of February.
节选自 https://kde.org/announcements/plasma/5/5.20.90/