You just see that options because it doesn’t fit in the screen if you scale the screen you’ll see the app properly.
The other way is to use gsettings to change them.if you want to see you actual fonts use:
gsettings get org.gnome.desktop.interface monospace-font-name
gsettings get org.gnome.desktop.interface document-font-name
gsettings get org.gnome.desktop.interface font-name
gsettings get org.gnome.desktop.wm.preferences titlebar-font
And to replace them use for each of them, using the font name that you would like to change (mind that in this case is set instead of get).
gsettings set org.gnome.desktop.wm.preferences titlebar-font ‘Ubuntu Bold 12’