I wasted a lot of time trying to remote VNC login to a laptop running TW with KDE, the way you think you should do it, just doesn’t work.
I went into Yast > Network services > Remote Admin (VNC) and selected the option to enable VNC. What happens when I do the remote login using RealVNC Viewer is I get a black screen?
I can’t figure out what’s going on. I am still using the X11 display manager because Waylan is not ready.