Applications not opening

Applications requiring root privileges such as Gparted, KDE Partition,Print Settings, do not open from the menu. In order to use them I have to go to the command line. I installed LXQT-sudo but that has not changed anything. Is there something else I need to do to make these apps run?
Thank you

Make sure you have a polkit-agent installed and enabled on startup.

Polkit service must be running. Check it with:

systemctl status polkit.service   

polkit service is activated and loaded