KDE Plasma Next packages Oxygen as default font
The size of many widgets depend on the font as they adjust depending on the space required to fit text. The problem increases with translated versions of the text. Sebastian explains that Plasma relies on sensible font settings and metrics for better support of HDPI displays. There is a stronger emphasis on fontsize-as-rendered-on-a-given screen. The UIs are designed to fit a certain number of columns and rows of text with ample dynamic spacing, so that even translations fit well. The size of the UI elements are roughly the same size on different displays. This design seems to be received well by the users.