Touchpad does not turn off when typing sometimes

I am currently using Touchpad-Indicator app, because the GNOME tweak tool is not helping me shutting off the touchpad when typing...

Sometimes it shuts it off, sometimes it doesnt. (And also Touchpad-Indicator tend to not startup when I start my PC, even though it is in the "startup applications") - I would like my touchpad to turn off as well as it does in Windows (it never bothers me there)...

PC model: Thinkpad X1 Tablet G2

Thanks in advance for any help!