How can I disable the touchpad while typing on KDE?
Is there such a setting like in gnome?
Application menu -> Utilities -> touchpad management. There, you can ask the system to disable the touchpad when a usb mouse is connected and/or when you are typing.
sudo apt install kde-touchpad
kcmshell5 kcm_touchpad or
And you'll even have an option to disable touch and scroll only, leaving you the ability to move the cursor.
Did you try touchpad-indicator? You can install it using these commands while in a terminal:
sudo add-apt-repository ppa:atareao/atareao sudo apt-get update sudo apt-get install touchpad-indicator