r2com Show me where you started to learn how to install the nvidia driver from ports or packages from the very beginning and not by first downloading from nvidia. I repeat! All your questions here would have been answered if you followed the Handbook instead. End of discussion for me.
guess what, I'll just show you how I solved it:
1) I found this thread
Hi, all. Glad to be here. Here's my problem: I type startx to start x11/xorg and run x11/kde5 The screen goes blank except for the mouse cursor and a keyboard cursor in the far upper left. Nothing appears to happen when I move the mouse or click its buttons, or when I type on the keyboard...
forums.freebsd.org
2) then I did remove nvidia_load="YES" from /boot.loader.conf (just as author of that post)
3) then I did: sysrc kld_list+="nvidia-modeset"
4) then I did "nvidia-xconfig" again and rebooted, after reboot and login as user in console, I did startx and loaded in proper 4K screen.
Oh and I also tried following *helpful* members: thanks to monwarez, bsduck, T-Daemon, bakul
marking it as "solved" for now.
I am open to any other comments regarding settings, or improvement of this flow or anything what could help making right decision next time or for another machine
p.s. and of course i still will refer to handbook and look at it as long as it has necessary info, but unfortunately its not always the case and external help is required, especially for newcomers