I entered this command misunderstanding what would happen and it changed all my desktop manager settings. I already rebooted twice (and selected Xubuntu as usual) but some settings are still changed. I have fewer workspaces than before, there's an annoying sound whenever I press backspace too often, I have a panel at the top of my main monitor that has no setting to remove it, and my keyboard shortcuts don't work anymore.
I checked out How can I undo `gnome-shell --replace`? and it didn't help, please don't mark this as duplicate