How can I change the default font on Qt5 applications (e.g. QupZilla browser)? Changing font settings either on the system (Cinnamon) or on the app itself doesn’t do anything. I’m using a fresh Antergos installation with Adwaita controls theme. Right now the default font for all Qt5 applications is a Serif font (see the image below), but why is that? My other computers with older Antergos installations have nice Sans Serif fonts on all Qt5 apps.
It seems that this problem occurs only on the latest Antergos ISO-release (version 18.1), but I can’t figure out which configuration file(s) should I edit to fix the font?
I don’t know if this is related to the font problem but I noticed several (apparent) leftover files and folders in my home directory right after finishing Antergos installation. These files probably don’t belong to a fresh Cinnamon installation?
~/.config/i3 ~/.config/i3status ~/.config/lxterminal ~/.config/nitrogen ~/.config/openbox ~/.config/plank ~/.config/qtcurve ~/.config/razor ~/.config/terminology ~/.config/tint2 ~/.config/volumeicon ~/.config/chromium-flags.conf ~/.config/compton.conf ~/.config/conky.conf ~/.config/kdeglobals ~/.config/Trolltech.conf ~/.config/yad.conf
These same files can also be found inside the system’s skeleton directory (/etc/skel) and root’s home folder (/root).
Here is a font comparison showing QupZilla (which is a Qt application) on latest Antergos ISO-release (the top image) and on older Antergos installation (the bottom image).