Touchpad too sensitive

Ah... I understand the issue, now.
Let me look at the .conf file and see if I can find anything.

Ensure that synaptics is installed:

sudo apt install xserver-xorg-input-synpatics

I believe the path should be /usr/share/X11/xorg.conf.d/70-synaptics.conf
Open that file in a Root Elevated Text Editor or in terminal with nano.
See this section:

Section "InputClass"
        Identifier "touchpad catchall"
        Driver "synaptics"
        MatchIsTouchpad "on"
# This option is recommend on all Linux systems using evdev, but cannot be
# enabled by default. See the following link for details:
# http://who-t.blogspot.com/2010/11/how-to-ignore-configuration-errors.html
      MatchDevicePath "/dev/input/event*"
EndSection
Section "InputClass"
        Identifier "touchpad ignore duplicates"
        MatchIsTouchpad "on"
        MatchOS "Linux"
        MatchDevicePath "/dev/input/mouse*"
        Option "Ignore" "on"
EndSection

You want to add a couple more options here in the space above EndSection.

"Option" "FingerLow" "20"
"Option" "FingerHigh" "20"

Be sure to Save The File. Then reboot and test.
This next part may get tedious... I do not know the proper values you need for those... 20 may suit. Or maybe they should be 5 instead. I have no idea... I do not have a touchpad so I cannot test this.
But you may need to fiddle with both of those values a bit to find the sweet spot.

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