A GNOME Shell extension allowing the user to set the position of the OSD windows for sound or luminosity.
Please install it from https://extensions.gnome.org/extension/1220/move-osd-windows/
Download the files and run ./install.sh
You may need to restart the gnome shell environment ("logout and login again", or alt+f2 + r + enter).
Then, enable the extension in the system preferences (gnome tweaks or whatever).