Problem with rights in Xfce

I installed Kali 2020.3 on HyperV. But response of Xfce GUI was quite poor. So then i followed instructions here https://www.kali.org/docs/virtualiza...kali-guest-vm/ and succesfully enabled Enhanced Session Management. Since this response of the GUI become ok. But I experinced another problem since this. When I run ie. nm-connection-editor from a menu, it seems to be unprivilleged. All editing controls are gray. I am unable to change settings. When I try to run nm-connection-editor fom a terminal window as a root I get following error:

No protocol specified
Unable to init server: Could not connect: Connection refused

(nm-connection-editor:3108): Gtk-WARNING **: 09:52:47.330: cannot open display: :1.0