I wrote some simple apps in qt4 that worked normally under kde4. After i switched to the kde framework 5 the default ui elements of qt4/5 apps (QPushButton, QLineEdit,...) are displayed way too big, therefore the size of the widgets increased and the app doesn't fit on the screen anymore. While using kde 4 it was possible to fit two apps side by side on one screen. Now the interface takes up nearly 80% of the screen for only one widget. Is there a way to scale down the size of the default ui elements? The DPI settings under kde4 were equal. Reproducible: Always
Selecting the "MS Windows 9x" style leads to smaller buttons but they are still too big
Not a bug in KWin - KWin is not responsible for anything DPI related or widget style related. I do not know which component might be related to it, thus moving to kde/general in the hope that someone else knows where to assign it to.
> Is there a way to scale down the size of the default ui elements? Use a different widget style, such as QtCurve or Skulpture. For Plasma 5, KDE developers increased the default size to follow the trend of High-DPI and finger-friendly interfaces.