19/05/2023: A causa di un errore sono stati cancellati, insieme ad account creati da bot, alcuni account legittimi. Si prega di leggere qui: https://www.gambas-it.org/smf/index.php?topic=9733.0
Just use a smaller font for QT applications, by using the qt5ct program (or qt4-qtconfig if you are using Qt4).
According to "the Internet", another tip is forcing Qt program to use GTK theme by putting "QT_STYLE_OVERRIDE=gtk" in your environment.