KDE Plasma ' Archlinux: my cursor jumps and clicks everywhere and it has become more severe

**Problem:** my cursor jumps and clicks everywhere, and it has become more severe - it is maddening :'( This question I have seen before in forums and tried their suggestions, but I still have this problem. **What I tried:** 1. I found a possible solution: lowering KDE Plasma's sensitivity, but this dialogue window was gray colored. 2. Then I found the reason and solution for this graying: it was libinput. Here are the links I read: https://www.reddit.com/r/kde/comments/d21mwv/why_are_my_touchpad_sensitivity_settings_greyed/ and https://forum.kde.org/viewtopic.php?t=130072 - see coryw Thu Mar 21. But removing libinput makes my keyboard non-functional. **Now:** I do not know what I can do. **System:** Arch-linux for Surface Pro 4 and KDE up to date. Best and thank you in advance, Roberto **I FOUND THE SOLUTION!:** disable touch screen instead of touchpad, see: https://unix.stackexchange.com/questions/590012/mouse-cursor-jumping-around-the-screen-and-clicking-on-hp-pavilion-x360 **This information tells you how to disable touch screens for Arch Linux:** https://growworkinghard.altervista.org/enabledisable-touch-screen-on-arch-linux/ I hope others will solve this problem of a jumping cursor!