Krusader complains about not being able to handle the 'kdeconnect' protocol if entered in the address-bar of a panel. Dolphin does indeed show the remote filesystem of a phone, for example Reproducible: Always
It should be introduced in git version by this patch : https://quickgit.kde.org/?p=krusader.git&a=commit&h=b7ab125d78837cdc236424f6af17b86f24cd80ac I have no way to test it, though.
Entering "kdeconnect:" + Enter works. Of course, kdeconnect must be installed.