Graphical UI not working in VNC viewer in SUSE Linux 15 SP2 VN

hello all,
I have recently installed SUSE 15 SP2 and forgot to select gnome desktop as system role and after installation of OS, i have installed gnome packages and configured vnc server, but still in vnc viewer i am still seeing black screen without UI. Can you please let me know how to reconfigure gnome for VNC server?

Any update on this? Please help me as i am stuck and no work around.