Debian based Linux on the Framework Laptop

Framework Laptop 13 Linux
34

I’ve tested

$ cat /etc/X11/xorg.conf.d/20-touchpad.conf 

Section "InputClass"
        Identifier "touchpad"
        Driver "libinput"
        MatchIsTouchpad "on"
        Option "Tapping" "on"
EndSection

but it does not solve the problem I’ve described here (Debian testing under XFCE4, verified under Debian 11.3. live installer)
Do you have any further hints?
Kind regards, Andreas.