“Mouse and Touchpad” > “Touchpad” > “General” > ???
I assume he doesn’t want to disable it completely. Maybe this old thread from the Archforum can help?
https://bbs.archlinux.org/viewtopic.php?pid=1576555#p1576555
It’s quite old but maybe still valid.
Lost in translation, my issue is a missing setting under “Touchpad” > “General”.
Above “Tap Touchpad to Click” there’s supposed to be “Disable Touchpad While Typing”.
See if the info here might help. Look at 3.5 and 3.6.
https://wiki.parabola.nu/Touchpad_Synaptics#Disable_Trackpad_while_Typing
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I want to enable touchpad while typing. 
There is a thread on the Antergos-Forum. Pretty similar… yeah it’s a Macbook but still Synaptics driver. 
https://forum.antergos.com/topic/10087/how-to-enable-touchpad-while-typing