I was mistaken about that; PLASMA_USE_QT_SCALING=1 has no effect. What's needed is to adjust the global scale using the Displays page, not by manually setting the font DPI to something else.
I was mistaken about that; PLASMA_ USE_QT_ SCALING= 1 has no effect. What's needed is to adjust the global scale using the Displays page, not by manually setting the font DPI to something else.