If you want to disable touchscreen Chromebook with a shortcut, you need to turn on the debugging shortcuts first. Launch Chrome and enter chrome://flags/#ash-debug-shortcuts, choose Enabled for Debugging keyboard shortcuts, and then restart your device. Once you are back up, hold down Search + Shift + T to deactivate the touchscreen right away. This key combination turns touch input on and off, so if you press it again, the touchscreen will be re-enabled.
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