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Immediately disabling touchscreen capabilities on a Chromebook can be done with a quick keyboard shortcut, but only after you have turned on debugging shortcuts. Primarily, you need to launch Chrome and enter chrome://flags in the address bar. Look for Debugging keyboard shortcuts and set it to enabled, then restart your Chromebook. After it starts up, just hit Search + Shift + T to turn off the touchscreen straight away. This combo of keys turns the touch function off or on, so you are free to use it as per your convenience. It is definitely the quickest way to stop unintentional touches while you are on the keyboard, trackpad, or even cleaning the screen, etc. Read more: https://datarecovee.com/how-to-turn-off-touchscreen-on-chromebook/