Open Chrome.
Type `chrome://flags` in the address bar.
Search for `Touch Events` or `Touchscreen`.
Disable any relevant touch-related flag if available.
Restart the Chromebook.
If no touch-related flag exists, use a ChromeOS extension or kiosk policy only if your device is managed.
For managed Chromebooks, ask the administrator to disable the touchscreen through device policy.
On most Chromebooks, there is no built-in user setting to permanently disable the touchscreen.