I've tried this fork (Installing the AUR package) because I was checking the issues in the main kmscon repo and I see that one which suggest this fork could fix that bad rendered width for fonts but they are still cut in a half. That's my /etc/kmscon/kmscon.conf

# config file for kmscon linux console
xkb-layout=es
#xkb-variant=neo
font-name=DejaVuSansMono Nerd Font
font-size=10
hwaccel

Another question is that I'm not getting the terminal in a full size filling all the screen, I'd thought this might be because my laptop PC has a integrated display more little than my desktop display, but it is also happening in my desktop PC. So I guess I must setup the resolution in some way.