And besides that, try installing x11/mate Good and functional window manager.free-and-bsd, thanks for clarifying that. Yes my Application menu is available. I will try to research pitfalls during Xfce upgradation. I will also try to launch pcmanfm file manager.
Alexander88207, the following is the output of /var/log/Xorg.log : https://termbin.com/v0z9
In the file /etc/rc.conf, the entry dbus_enable="YES" is present.
Alexander88207, I referred your post here to uninstall and then re-install xfce desktop and other associated packages. Now my desktop background appears with all icons in the background. Thanks. My problem got solved.
Thanks to everyone on this thread for your time. I learnt much more in the process, and am better informed.
… FreeBSD 12.2 … T420
… xf86-intel-video and xfce …
… not even C-Alt-F1 works …