Comment # 3 on bug 1192148 from Stefan Hundhammer

Unlike the simple YaST Qt control center, the YaST Qt UI (libyui-qt) does not
save its window size and position to a config file and restores it upon the
next restart; rather, it has a quite elaborate algorithm to calculate the
initial size of "default size" (wizard-style) windows:

https://github.com/libyui/libyui/blob/master/libyui-qt/src/YQUI.cc#L360-L407

The starting point of this is whatever Qt considers the "primary screen":

https://doc.qt.io/qt-5/qguiapplication.html#primaryScreen-prop

So it will take the size of your primary screen, and since all of your screens
are larger than 1024x786, it will use 70% of it for both dimensions.

This usually works well. But if the dimensions or, as in your case, even the
orientation of a multi-screen setup are radically different, problems like the
one you described can occur: The initial calculation can be way off.

The problem may be that Qt made a wrong decision what exactly is your primary
screen. Maybe that can even be configured somewhere (in KDE? With xrandr?), but
if yes, I don't know where.


As a workaround (admittedly a kludge) I could offer using the -geometry command
line option when starting a YaST module from the command line; like this:

  yast2 -geometry 1000x800 module_name

or

  yast2 -geometry 1000x800+0+0 module_name