to make touchscreen work:
echo "blacklist usbtouchscreen" | sudo tee -a /etc/modprobe.d/blacklist.conf
for touchpad configuration create a file /etc/X11/xorg.conf.d/50-libinput.conf
with this content:
Section "InputClass"
Identifier "XPS13 settings"
MatchDriver "libinput"
MatchProduct "DLL0704:01 06CB:76AE Touchpad"
Option "NaturalScrolling" "on"
Option "AccelProfile" "flat"
Option "AccelSpeed" "1"
EndSection
To have a proper "MatchProduct" property value use xinput list
command