Nvidia GeForce GTX 1650 - no external monitor - not detected in xrandr (Opensuse Leap 15.3)

Your config is slightly messy, having two xorg configs. Please delete both
/etc/X11/xorg.conf
/etc/X11/xorg.conf.d/90-nvidia.conf
and instead create /etc/X11/xorg.conf.d/10-nvidia-primary.conf

Section "OutputClass"
    Identifier "Nvidia Prime"
    MatchDriver "nvidia-drm"
    Driver "nvidia"
    Option "AllowEmptyInitialConfiguration"
    Option "PrimaryGPU" "Yes"
EndSection