SDDM Scaling
After updating to Fedora 40 found the login page sddm (correct word: Display Manager) at the wrong scale. To rectify:
nvim /etc/sdd.conf
add
[General]
GreeterEnvironment=QT_SCREEN_SCALE_FACTORS=1,QT_FONT_DPI=72
[Wayland]
EnableHiDPI=true
Asahi series