It asks nothing, that is the problem.
P.S. I removed myself from wheel on first day I started using Manjaro .
It just runs and I can change dconf as I want. The problem is that it asks nothing, literally, not for root passoword nor sudo.
“DConf Editor” is not a system level application; it makes changes to user settings, more specifically, to ~/.config/dconf/user.
As to menu-started applications you can play games with launching it through e.g. sudo sudo -u <theuser> or alike or more explicity grab a password – but as to said user simply typing dconf into a terminal you’d have issues, and frankly shouldn’t even want to: of the major OS-en Linux is by far worst at keeping the computer from doing what its user says…
To be clear: specifically as to e.g. the graphical application “DConf Editor” you could do as you ask via playing games with sudo/pkexec/polkit but it’s in the end useless; if as in that dconf case the user has access in a fundamental manner he/she can bypass any/all
That said – it used to in fact be a common occurrence on the distribution where I came from that ~/.config/dconf became root-owned due to starting a filemanager through sudo, and that has the effect of shutting the user out of his/her settings: if you don’t want your user to have any write access to ~/.config/dconf/user you could do sudo chown -R root: ~/.config/dconf and log out and back in.
Although that didn’t seem to have large detrimental side-effects, it’s a dreadful hack: just say no to trying to lock down your users from adjusting their own settings.
I did it. And my user session stopped working at all. I had to go to TTY and as a root change it back typing chown -R <user> ~/.config/dconf. I couldn’t also log back in, so yeah. I’m not typing this again, but thanks for trying ^^