- Edited
I created the file /etc/X11/xorg.conf.d/20-intel.conf only with:
Section "Device"
Identifier "Intel Graphics"
Driver "modesetting"
EndSection
Now 2 displays and taskbar, but still big fonts in apps and system.
The only exception I have found so far is Firefox , it has the correct font size in menus, but big font in window title.
Thank you bvbfan