I have Ubuntu 20.04 upgrade from 18.04, now every time I launch gnome-control-center, the initial window position is outside of the screen (right side), I have to used short key Alt + F7
to move into the screen to do the rest of settings.
I didn't have dual monitor.
I have tried reset all the settings by the following methods, but it didn't work.
$ dconf reset -f /org/gnome
or
$ gsettings reset-recursively org.gnome.shell
Similar issue happened in gnome-nautilus, but I got this fixed by
$ gsettings reset-recursively org.gnome.nautilus
How to make an gnome app initial window location to its default values?
unknown display
plus a builtin display under theDisplay
setting entry. I guess the nvidia driver not work properly after upgrade. After doubuntu-drivers devices
to check andsudo ubuntu-drivers autoinstall
to install, then reboot, the unknown display is gone, only one builtin display, and all apps work fine now. See also Unknown display in Ubuntu – alijandro Jun 23 '20 at 14:23