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.